Brain Injury and Concussion Statistics (2026)

Last Updated: June 2026

Traumatic brain injury is among the most consequential and most underappreciated public health problems in the United States and globally. Its reach is broad — from the professional athlete whose repeated concussions accumulate across a career, to the elderly person who falls in the bathroom and strikes their head on the tile, to the soldier whose brain absorbs the pressure wave of a nearby explosion. Its consequences range from temporary cognitive disruption to permanent disability and accelerated neurodegeneration. And its true scale is almost certainly larger than official statistics capture, because a significant proportion of brain injuries — particularly sports-related concussions and mild traumatic brain injuries — go unrecognized, unreported, or misdiagnosed.

The science of brain injury has advanced considerably over the past two decades, driven by the discovery of chronic traumatic encephalopathy (CTE), the development of blood-based biomarkers for detecting neural damage, improved neuroimaging techniques, and sustained research investment driven partly by high-profile legal and policy disputes about contact sports safety. What has emerged is a more nuanced and more sobering picture of injury consequences than previously understood — and a clearer framework for prevention, recognition, and recovery.

The statistics in this article are drawn from the Centers for Disease Control and Prevention (CDC), the National Institutes of Health (NIH), the Brain Trauma Foundation, the Boston University CTE Center, the U.S. Department of Veterans Affairs, and peer-reviewed journals including JAMA Neurology, The Lancet Neurology, and Neurology. For the broader context of how brain injury fits within overall brain health data, see our flagship article Brain Health Statistics: 50+ Key Facts (2026).

Key Brain Injury and Concussion Statistics at a Glance

• Approximately 2.8 million Americans sustain a traumatic brain injury each year, resulting in 56,000 deaths and more than 300,000 hospitalizations. (CDC)
• Sports-related concussions account for an estimated 1.6 to 3.8 million cases per year in the United States, with the majority going unreported. (Journal of Athletic Training)
• CTE was found in 87% of studied NFL players’ brains postmortem, in the largest neuropathological study of its kind. (Boston University CTE Center)
• A single moderate TBI more than doubles the risk of developing Alzheimer’s disease in later life. (JAMA Neurology)
• An estimated 3.2 to 5.3 million Americans are currently living with a long-term disability resulting from a TBI. (CDC)
• Veterans have a TBI prevalence rate approximately 19 times higher than the general population, driven by combat exposure. (U.S. Department of Veterans Affairs)
• Falls are the leading cause of TBI across all age groups, accounting for approximately 48% of all TBI-related emergency department visits. (CDC)

Traumatic Brain Injury: Scale and Incidence

Traumatic brain injury is defined as a disruption in normal brain function caused by an external force — whether a blow, jolt, bump, or penetrating injury to the head. The category spans an enormous range of severity, from brief alterations in consciousness to catastrophic structural damage, and its epidemiology reflects the diversity of causes and populations affected.

Overall TBI Incidence in the United States

National data from the CDC provides the most comprehensive picture of TBI incidence, though the figures are widely recognized as underestimates because many mild TBIs are never reported or treated in formal healthcare settings.

• Approximately 2.8 million Americans sustain a traumatic brain injury each year, resulting in approximately 56,000 deaths, more than 300,000 hospitalizations, and approximately 2.2 million emergency department visits. (CDC)
  The majority of TBIs — approximately 75 to 80% — are classified as mild, a designation that refers to the initial severity of injury rather than the potential for lasting consequences, which can be significant even in mild cases.
• TBI is a leading cause of death and disability in the United States, contributing to approximately 30% of all injury-related deaths. (CDC)
  This proportion reflects TBI’s disproportionate lethality relative to other injury types — head injuries that would not otherwise be fatal become so due to the brain’s limited regenerative capacity and the catastrophic consequences of structural damage to critical neural tissue.
• Falls are the leading cause of TBI across all age groups, accounting for approximately 48% of all TBI-related emergency department visits. (CDC)
  The dominance of falls as a TBI cause reflects both their frequency — particularly among young children and older adults — and the vulnerability of the unprotected head during an uncontrolled fall.
• Motor vehicle crashes are the second leading cause of TBI deaths, accounting for approximately 20% of TBI fatalities. (CDC)
  Despite improvements in vehicle safety technology and seatbelt compliance, motor vehicle crashes remain a significant source of severe and fatal TBI — with speed, alcohol involvement, and failure to use restraints the primary modifiable risk factors.
• Being struck by or against an object is the leading cause of TBI emergency department visits among children aged 0 to 14 and adolescents aged 15 to 24. (CDC)
  This category includes sports and recreation injuries — a significant proportion of which are concussions occurring during athletic competition, practice, or unstructured physical play.
• An estimated 3.2 to 5.3 million Americans are currently living with a long-term disability resulting from a TBI, making TBI one of the leading causes of acquired disability in the United States. (CDC)
  The wide range in this estimate reflects the difficulty of tracking TBI survivors beyond the acute care setting — many individuals with significant long-term impairments are not captured in disability registries.

Global TBI Burden

Traumatic brain injury is a global health problem, with incidence rates and outcome profiles that differ significantly between high-income and low-and-middle-income countries.

• An estimated 69 million people worldwide sustain a TBI each year, with low-and-middle-income countries bearing approximately two-thirds of the global TBI burden. (Journal of Neurotrauma)
  Road traffic injuries — the leading cause of TBI in low-and-middle-income countries — are more prevalent and more severe in settings with less vehicle safety regulation, fewer helmets and seatbelts, and more vulnerable road users such as pedestrians and motorcyclists.
• TBI is the leading cause of death and disability in people under 40 globally, representing a disproportionate burden on the most economically productive age group in affected populations. (WHO)
  This age-concentration of TBI mortality and disability has significant economic consequences for affected families and communities, extending the impact of brain injury well beyond its direct neurological effects.
• In low-income countries, the case fatality rate for severe TBI is approximately 30 to 50%, compared to approximately 10 to 15% in high-income countries with access to neurosurgical care and intensive monitoring. (World Neurosurgery)
  The survival gap between income settings reflects differences in timely access to neurosurgical intervention, intracranial pressure monitoring, and intensive care — all of which substantially affect outcomes for severe TBI.

Concussion: The Most Common Brain Injury

Concussion is a mild traumatic brain injury caused by a biomechanical force to the head that produces a temporary disruption in brain function. Despite its classification as “mild,” concussion can produce symptoms that persist for weeks to months, and repeated concussions carry cumulative neurological risk that has become one of the most significant and contentious issues in sports medicine.

Concussion Incidence and Reporting

The true incidence of concussion is substantially higher than documented cases suggest, because underreporting is a pervasive problem across youth, amateur, and even professional sports settings.

• Sports-related concussions account for an estimated 1.6 to 3.8 million cases per year in the United States. (Journal of Athletic Training)
  The enormous range in this estimate reflects the underreporting problem: the lower bound captures cases presenting to medical attention, while the upper bound accounts for unreported injuries identified in population-based surveys and athlete self-report studies.
• An estimated 50% or more of sports-related concussions go unreported, driven by athlete reluctance to leave competition, fear of being seen as weak, uncertainty about whether symptoms constitute a concussion, and inadequate sideline assessment resources. (British Journal of Sports Medicine)
  Unreported concussions that go without medical evaluation and appropriate rest carry greater risk of second-impact syndrome — a rare but potentially catastrophic condition that occurs when a second concussion is sustained before the first has fully resolved.
• High school athletes sustain an estimated 300,000 concussions per year in the United States, with football, soccer, basketball, and wrestling accounting for the majority. (Pediatrics)
  High school sports represent a particularly high-risk setting for underreported concussion: athletes may be less sophisticated about symptom recognition, coaching cultures may implicitly discourage reporting, and medical oversight is often less comprehensive than at the professional level.
• Girls sustain concussions at higher rates than boys in comparable sports — including soccer, basketball, and softball versus baseball — and show more severe symptoms and longer recovery times when matched for injury mechanism. (American Journal of Sports Medicine)
  The female concussion vulnerability difference has been attributed to hormonal factors, differences in neck strength affecting head stabilization during impact, and possible differences in baseline cerebral blood flow — though the precise mechanisms remain under investigation.
• Repeat concussions within the same season occur in approximately 15 to 20% of athletes who return to play before full recovery. (Neurosurgery)
  The return-to-play period following concussion is the window of highest vulnerability for repeat injury — a biological reality that has driven the development of graduated return-to-play protocols as the standard of care in sports concussion management.

Cognitive Effects of Concussion

The immediate and short-term cognitive effects of concussion are well-characterized. The longer-term neurological consequences of single and repeated concussions are an area of active and sometimes contested research.

• Common cognitive symptoms of concussion include impaired memory, slowed processing speed, reduced attention and concentration, and difficulty with complex cognitive tasks, all of which resolve in the majority of cases within 7 to 14 days. (British Journal of Sports Medicine)
  The 7-to-14-day recovery window applies to most adults — adolescents and children typically take longer to recover, and a significant minority of concussion patients experience symptoms that persist for months in what is called post-concussion syndrome.
• Approximately 10 to 20% of concussion patients develop post-concussion syndrome, defined as symptoms persisting beyond three months after injury, including headache, fatigue, cognitive difficulties, sleep disruption, and mood changes. (The Lancet Neurology)
  Post-concussion syndrome is more common in women, older adults, those with prior concussion history, and those with pre-existing anxiety or depression — risk factors that have clinical implications for identifying patients who require more intensive follow-up.
• Neuroimaging during the acute concussion phase typically shows no structural abnormalities on standard MRI — yet functional MRI and diffusion tensor imaging frequently reveal subtle white matter changes and disrupted neural network connectivity. (Radiology)
  The invisibility of concussion on standard clinical imaging has historically contributed to underestimation of its neurological seriousness — advanced imaging techniques that reveal functional disruption without structural damage have helped close this gap.
• Blood-based biomarkers for concussion — including GFAP and UCH-L1 — can detect neuronal injury within hours of concussion with high sensitivity, providing an objective measure of injury severity that self-reported symptoms cannot supply. (JAMA Neurology)
  The FDA cleared blood tests for mild TBI detection in 2018, marking a significant advance in the objective assessment of an injury that has historically been diagnosed primarily on symptom report.

Chronic Traumatic Encephalopathy (CTE)

Chronic traumatic encephalopathy is a progressive neurodegenerative disease associated with repeated traumatic brain injuries, including concussions and subconcussive impacts — blows to the head that do not produce concussion symptoms but that still transmit significant mechanical force to the brain. The discovery and characterization of CTE has fundamentally changed how the medical and sports communities understand the long-term neurological consequences of contact sports participation.

• CTE was found in 87% of the NFL players’ brains studied in the largest neuropathological series of its kind, with 99% of donated brains from former players showing CTE pathology in the most severe stages. (Boston University CTE Center)
  These figures require important methodological context: the brains studied were donated by families of players who had experienced neurological symptoms during life, creating a significant selection bias. The true prevalence of CTE among all NFL players is not established by these figures.
• CTE has been identified in former players of multiple contact sports, including American football, soccer, rugby, ice hockey, boxing, and wrestling, as well as in military veterans with blast exposure histories. (Acta Neuropathologica)
  The breadth of sports and circumstances associated with CTE pathology has reinforced the conclusion that cumulative head impact exposure — rather than any single sport — is the defining risk factor.
• CTE is pathologically defined by the accumulation of phosphorylated tau protein in a distinctive perivascular distribution in the cortex — a pattern distinguishable from Alzheimer’s disease pathology and detectable only on postmortem examination. (Acta Neuropathologica)
  The inability to diagnose CTE in living individuals is the most significant limitation in the field — it prevents direct studies of CTE incidence, accurate risk communication to athletes, and assessment of potential interventions.
• Researchers at Boston University and elsewhere are developing PET imaging tracers capable of detecting tau deposition patterns consistent with CTE in living individuals, with several candidates in advanced clinical testing. (JAMA Neurology)
  A validated in-vivo diagnostic for CTE would transform the field — enabling accurate prevalence studies, clinical trials of potential treatments, and evidence-based counseling for athletes about their individual neurological risk.
• CTE symptoms typically emerge years to decades after the period of head impact exposure has ended, following an extended preclinical period during which tau pathology is accumulating without outward neurological signs. (Nature Reviews Neurology)
  This long latency period — comparable to Alzheimer’s disease in its decades-long preclinical phase — makes early intervention and prevention the most realistic targets for reducing CTE burden, given the absence of available treatments.
• CTE-related behavioral and cognitive symptoms include impulse control problems, depression, aggression, memory impairment, and progressive dementia in the most advanced stages. (Brain)
  The behavioral presentation of CTE — which often precedes obvious cognitive decline — has been associated with the high rates of substance abuse, depression, and suicidality reported in former professional contact sport athletes.

For data on how TBI relates to long-term dementia risk, see our article on Dementia and Alzheimer’s Statistics.

TBI and Long-Term Cognitive Consequences

Even a single moderate or severe traumatic brain injury produces lasting changes in brain structure and function that extend well beyond the acute recovery period. The long-term cognitive, psychiatric, and neurodegenerative consequences of TBI are among the most important findings in recent neurotrauma research.

• A single moderate TBI more than doubles the risk of developing Alzheimer’s disease in later life. (JAMA Neurology)
  The mechanism involves neuroinflammation, disruption of the blood-brain barrier, accelerated amyloid-beta accumulation, and tau pathology initiated by the injury — all of which converge to create a neurobiological environment favorable to Alzheimer’s disease development.
• Severe TBI is associated with a four-fold increase in Alzheimer’s risk and a six-fold increase in overall dementia risk compared to age-matched individuals without TBI history. (The Lancet Neurology)
  The dose-response relationship between injury severity and subsequent dementia risk reinforces the causal interpretation of the association — more severe injuries produce more neuroinflammation, more blood-brain barrier disruption, and more initial neuronal loss, each of which contributes to long-term neurodegeneration risk.
• TBI survivors show significantly elevated rates of depression, anxiety, and PTSD compared to age-matched controls without TBI history, with psychiatric comorbidities affecting an estimated 25 to 50% of individuals with moderate-to-severe TBI within the first year. (Journal of Neurotrauma)
  The psychiatric sequelae of TBI reflect both the structural damage to emotion-regulating brain circuits and the profound psychological impact of sudden disability, identity disruption, and the cognitive changes that follow significant brain injury.
• Cognitive impairments following moderate-to-severe TBI include deficits in attention, working memory, processing speed, executive function, and learning that persist beyond the acute recovery period in a significant proportion of survivors. (Neuropsychological Rehabilitation)
  These cognitive deficits are the primary drivers of TBI-related disability — more so than physical impairments in many cases — and represent the most significant barrier to return to work, independent living, and quality of life after injury.
• Approximately 30 to 40% of individuals with moderate-to-severe TBI are unable to return to their pre-injury employment within two years of injury. (Journal of Head Trauma Rehabilitation)
  The occupational impact of TBI — affecting individuals during their most productive working years in the majority of cases — represents a substantial economic and social burden that extends far beyond the individual and their family.
• White matter damage — injury to the brain’s long-range connective fiber tracts — is among the most common and most functionally significant consequences of TBI, affecting information transfer between brain regions in ways that standard MRI often fails to detect. (Brain)
  Diffusion tensor imaging, which measures the directionality and integrity of white matter fiber tracts, has revealed the extent of white matter damage in TBI survivors that conventional neuroimaging misses — a finding with significant implications for prognosis and rehabilitation planning.

For data on how stress, sleep disruption, and mental health challenges compound the neurological effects of TBI, see our article on Mental Health and Cognitive Function Statistics.

Military TBI and Blast Injury

Military service members and veterans face a distinct TBI exposure profile — characterized by blast injury from improvised explosive devices and other munitions — that has driven significant advances in neurotrauma understanding while creating a large population of affected individuals with complex, often unrecognized neurological injuries.

• TBI has been called the “signature injury” of the wars in Iraq and Afghanistan, with an estimated 413,858 service members diagnosed with TBI between 2000 and 2022. (Defense and Veterans Brain Injury Center)
  The prevalence of TBI in this military generation reflects both the widespread use of improvised explosive devices by adversaries and improvements in body armor that protect against lethal blast injuries while leaving the brain exposed to pressure wave damage.
• Veterans have a TBI prevalence rate approximately 19 times higher than the general population. (U.S. Department of Veterans Affairs)
  The extraordinary gap between veteran and civilian TBI prevalence reflects both combat exposure and the physical demands and accident risks of non-combat military service — training injuries, vehicle accidents, and occupational hazards contribute substantially.
• Blast-induced TBI produces a distinct injury pattern from impact-based TBI, involving diffuse axonal injury throughout the brain’s white matter rather than the focal contusions more typical of blunt head trauma. (Journal of Neurotrauma)
  The diffuse nature of blast injury — distributed throughout the brain rather than concentrated at an impact point — makes it more difficult to detect on standard neuroimaging and more challenging to correlate with specific cognitive deficits.
• The co-occurrence of TBI and PTSD in veterans is extremely common, with estimates ranging from 33 to 44% of veterans with TBI also meeting criteria for PTSD. (JAMA)
  The symptom overlap between mild TBI and PTSD — including memory problems, sleep disruption, irritability, and concentration difficulties — creates significant diagnostic complexity that complicates both research and clinical management.
• Veterans with TBI history show significantly accelerated cognitive aging, with brain imaging revealing neurological age estimates 3 to 5 years older than chronological age on average. (Neurology)
  Accelerated brain aging in veterans reflects the compounding effects of TBI pathology, chronic stress, sleep disruption, and the other neurological risk factors concentrated in this population.
• Suicide rates among veterans with TBI are approximately twice those of veterans without TBI, highlighting the psychiatric risk that accompanies the neurological consequences of military brain injury. (JAMA Psychiatry)
  The relationship between TBI and suicide risk operates through multiple pathways: neurological damage to impulse control and emotional regulation circuits, psychiatric comorbidities including depression and PTSD, pain, substance use, and the psychosocial challenges of disability.

TBI in Special Populations

The epidemiology and consequences of TBI differ significantly across population subgroups, with children, older adults, and athletes each representing distinct risk profiles and outcome patterns that deserve specific attention.

Pediatric TBI

Children and adolescents are among the most frequently injured and the most neurologically vulnerable populations in the TBI landscape.

• TBI is the leading cause of death and disability in children and adolescents in the United States, with approximately 800,000 pediatric TBI visits to emergency departments annually. (CDC)
  Falls and being struck by or against objects are the leading causes in young children, while sports and recreation injuries become the primary cause in adolescents.
• Children sustain concussions at the same or higher rates than adults from equivalent impacts, due to biomechanical factors including larger head-to-body ratios, weaker neck musculature, and the presence of more cerebrospinal fluid relative to brain volume. (Pediatric Neurology)
  The developing brain’s greater vulnerability to concussive injury makes pediatric concussion management a distinct clinical challenge from adult concussion, with more conservative return-to-play guidelines supported by the evidence.
• Pediatric concussion recovery typically takes longer than adult recovery — averaging two to four weeks in most studies compared to one to two weeks for adults — with a subset of children experiencing symptoms for months. (British Journal of Sports Medicine)
  The longer recovery period in children reflects the ongoing neurodevelopmental processes that concussion disrupts — myelination, synaptic pruning, and the maturation of long-range neural networks that are still in progress during childhood and adolescence.
• Children with a history of prior concussion are three to five times more likely to sustain another concussion compared to children without concussion history. (Pediatrics)
  This vulnerability increase — whether due to underlying neurological differences that predispose to injury or to lingering neurological changes from prior concussion — reinforces the importance of adequate recovery before return to contact activity.

TBI in Older Adults

Falls among older adults are the largest single contributor to TBI incidence in the U.S. population, and TBI in this age group carries substantially worse outcomes than equivalent injuries in younger individuals.

• Adults aged 75 and older have the highest rates of TBI-related hospitalizations and deaths of any age group. (CDC)
  Older adults are at greater risk of serious complications following TBI due to pre-existing brain atrophy, cerebrovascular disease, anticoagulant medication use, and reduced neuroplasticity available for recovery.
• TBI in adults over 65 is associated with significantly accelerated cognitive decline, with affected individuals showing rates of cognitive deterioration roughly equivalent to those following a mild stroke. (JAMA Neurology)
  The synergistic relationship between TBI pathology and pre-existing age-related neurodegeneration means that even relatively minor TBI in older adults can tip neurological function below critical thresholds in ways that would not occur in younger individuals with equivalent injury severity.
• Fall prevention programs for older adults reduce TBI incidence by approximately 20 to 30% in community-based randomized trials, through exercise, environmental modification, and medication review. (JAMA Internal Medicine)
  Fall prevention is the most effective population-level TBI prevention strategy available for the largest TBI risk group — a straightforward public health intervention whose implementation remains inadequate relative to its demonstrated benefit.

Prevention, Detection, and Recovery

The science of TBI prevention, early detection, and recovery has advanced substantially and continues to produce findings with direct practical implications. Understanding what works — and the gaps that remain — is essential context for anyone working in sports medicine, clinical neurology, public health, or policy.

Prevention Strategies

TBI prevention operates across multiple levels — equipment, rules, education, and environmental design — with variable but often substantial evidence for effectiveness.

• Helmet use reduces the risk of head injury by approximately 60 to 85% in bicycle, motorcycle, and ski accidents, making helmet promotion one of the most evidence-backed TBI prevention interventions available. (Cochrane Reviews)
  Helmet effectiveness varies by activity, helmet type, and impact mechanism — helmets are designed to prevent skull fracture and severe TBI rather than to eliminate concussion risk, a distinction that is frequently misunderstood by athletes and parents.
• Rule changes in contact sports — including targeting rules in American football, heading restrictions in youth soccer, and stricter checking rules in ice hockey — have been associated with measurable reductions in head impact exposure when compliance is enforced. (British Journal of Sports Medicine)
  The effectiveness of rule changes depends entirely on enforcement and culture — rules that are systematically unenforced or culturally circumvented produce no measurable injury reduction.
• Neck strengthening programs reduce head acceleration during impacts by approximately 10 to 20%, with stronger neck musculature providing greater stabilization that limits the rotational forces most associated with concussive brain injury. (Journal of Strength and Conditioning Research)
  Neck strengthening is a low-cost, accessible prevention strategy with a plausible biomechanical mechanism — and one of the few interventions that addresses the injury mechanism rather than relying on equipment or rule enforcement.

Recovery and Rehabilitation

Recovery from TBI ranges from nearly complete restoration of function for mild injuries to lifelong disability management for severe injuries. The science of optimizing recovery has generated several well-supported clinical recommendations.

• Rest immediately following concussion — avoiding both physical and cognitive activity — remains the standard initial management recommendation, though evidence now suggests that prolonged rest beyond 24 to 48 hours may delay rather than accelerate recovery. (British Journal of Sports Medicine)
  The evolution from “complete rest until asymptomatic” to “relative rest followed by gradual reintroduction” reflects a growing understanding that the brain, like other injured tissues, benefits from progressive loading during recovery rather than indefinite protection.
• Sub-symptom-threshold aerobic exercise during concussion recovery — specifically, aerobic activity that does not exacerbate symptoms — accelerates return to normal function compared to complete rest in multiple randomized controlled trials. (JAMA Pediatrics)
  Prescribed aerobic exercise during recovery, at intensities below the symptom threshold for each individual, has become the leading evidence-based approach for active concussion management — a significant shift from the complete cognitive and physical rest previously recommended.
• Cognitive rehabilitation programs for moderate-to-severe TBI survivors show significant improvements in attention, memory, and executive function compared to standard care, with the greatest benefits seen in programs that are intensive, structured, and tailored to the individual’s specific cognitive profile. (Neuropsychological Rehabilitation)
  The neuroplasticity-based rationale for cognitive rehabilitation is well-established: the injured brain retains capacity for functional reorganization and compensatory strategy development, particularly when rehabilitation is begun early and maintained consistently.
• Sleep quality following TBI is a critical determinant of recovery outcome, with poor post-TBI sleep associated with worse cognitive outcomes, higher rates of depression, and slower return to baseline function. (Journal of Neurotrauma)
  Treating sleep disturbance — which is extremely common following TBI, affecting 30 to 70% of survivors — is now recognized as an essential component of comprehensive TBI rehabilitation rather than a secondary concern.
• Omega-3 fatty acid supplementation following TBI has shown neuroprotective effects in animal models and is associated with improved outcomes in preliminary human observational data, generating interest in its use as a dietary supplement during the recovery period. (Journal of Neurotrauma)
  DHA’s role in neuronal membrane integrity and its anti-inflammatory properties provide a plausible mechanism for post-TBI benefit — though large randomized controlled trials in humans are needed before supplementation can be recommended as standard care.

For data on how nutrition supports brain recovery and maintenance following injury, see our article on Nutrition and Brain Health Statistics. For data on how sleep quality affects neurological recovery and long-term brain health, see Sleep and Brain Health Statistics.

Key Takeaways

• Approximately 2.8 million Americans sustain a traumatic brain injury each year, with an estimated 50% or more of sports-related concussions going unreported — making TBI one of the most prevalent and most underrecognized neurological conditions in the country. (CDC, British Journal of Sports Medicine)
• A single moderate TBI more than doubles the risk of developing Alzheimer’s disease in later life, and severe TBI is associated with a six-fold increase in overall dementia risk — establishing TBI as a significant and underappreciated modifiable risk factor for neurodegeneration. (JAMA Neurology, The Lancet Neurology)
• CTE has been found in 87% of studied NFL players’ brains in the largest neuropathological series to date, though the inability to diagnose CTE in living individuals remains the most significant limitation in the field — one that researchers are actively working to overcome with in-vivo tau imaging tracers. (Boston University CTE Center, JAMA Neurology)
• Veterans sustain TBI at approximately 19 times the rate of the general population, and the co-occurrence of TBI and PTSD in 33 to 44% of affected veterans creates diagnostic complexity that complicates both research and clinical care in one of the most neurologically burdened populations in the country. (VA, JAMA)
• Sub-symptom-threshold aerobic exercise during concussion recovery now has randomized trial support as the leading evidence-based approach to active concussion management — replacing the previous recommendation of complete rest — with implications for how sports medicine practitioners, schools, and families approach concussion care. (JAMA Pediatrics)

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