Chronic Traumatic Encephalopathy (CTE): What We Know, What We Don’t, and Why It Matters

The Injury You Don’t Feel Until Years Later

Most people associate brain injuries with a single event.

A concussion.A blast exposure.A hard hit on the football field.A training accident.

The symptoms are expected to improve, and often they do.

But what happens when the impacts continue?

What happens when years of repetitive head trauma, blast exposure, and subconcussive injuries accumulate over time?

Researchers believe that for some individuals, the answer may be Chronic Traumatic Encephalopathy (CTE), a progressive neurodegenerative disease associated with repetitive brain trauma.

While much remains unknown, recent research continues to strengthen the connection between repeated brain injury, long-term neurological changes, cognitive decline, and alterations in behavior and mood.

For veterans, Special Operations personnel, athletes, first responders, and others with significant exposure histories, understanding CTE is becoming increasingly important.

What Is CTE?

Chronic Traumatic Encephalopathy (CTE) is a progressive brain disease associated with repeated head impacts and repetitive brain trauma.

Unlike a single concussion, CTE is believed to develop over years or decades following repeated exposure to:

• Concussions

• Subconcussive impacts

• Blast exposure

• Repetitive head trauma

• Contact sports participation

• Military operational environments

The hallmark feature of CTE is the abnormal accumulation of tau protein within the brain. Over time, these abnormal protein deposits can disrupt communication between brain cells and contribute to progressive neurological dysfunction (McKee et al., 2013).

Importantly, not everyone with a history of concussion develops CTE, and researchers are still working to understand why some individuals appear more vulnerable than others.

The Growing Connection Between CTE and Dementia

One of the most concerning findings from recent research is the relationship between advanced CTE and dementia.

A large National Institutes of Health-supported study found that individuals with advanced CTE pathology (Stages III and IV) were more than four times as likely to have been diagnosed with dementia compared to those with less severe disease (Stern et al., 2021).

This finding suggests that repeated brain trauma may contribute to long-term neurodegenerative processes that extend far beyond the initial injury.

For many veterans and athletes, this raises important questions:

• Does repeated brain trauma increase the risk of cognitive decline?

• Can early intervention help?

• How do we identify individuals at risk before symptoms become severe?

While definitive answers remain under investigation, the association between repetitive brain trauma and later-life cognitive decline continues to grow stronger.

Brain Injury and Accelerated Cellular Aging

Perhaps one of the most remarkable recent discoveries comes from researchers at Harvard Medical School.

Using advanced single-cell genomic analysis, investigators found that brain cells from individuals with CTE demonstrated extensive DNA damage and cellular abnormalities. The degree of damage observed was comparable to more than 100 years of excess cellular aging in some neuronal populations (Lee et al., 2024).

In simple terms:

Repeated brain trauma may not only injure the brain.

It may accelerate the biological aging of brain cells themselves.

This research helps explain why some individuals with extensive exposure histories report symptoms commonly associated with aging much earlier than expected:

• Memory problems

• Slower processing speed

• Reduced mental stamina

• Difficulty concentrating

• Executive dysfunction

While more research is needed, these findings provide important insight into the long-term biological effects of repetitive brain injury.

What Does CTE Look Like?

One of the challenges with CTE is that symptoms often do not appear immediately.

Many individuals function normally for years before changes become noticeable.

Research suggests symptoms commonly emerge 8 to 15 years after the initial injuries.

Clinically, two general presentations have been observed.

Younger-Onset Presentation

Often begins with behavioral and mood changes, including:

• Increased irritability

• Impulsivity

• Aggression

• Emotional reactivity

• Depression

• Anxiety

• Poor judgment

Over time, cognitive difficulties may become more apparent.

Older-Onset Presentation

Often begins with cognitive symptoms such as:

• Memory loss

• Attention deficits

• Executive dysfunction

• Difficulty organizing tasks

• Reduced cognitive flexibility

• Slowed thinking

As the disease progresses, behavioral and emotional symptoms may also emerge.

What It Feels Like in Real Life

Most people don’t walk into a clinic saying:

“I think I have CTE.”

Instead, they say:

• “I don’t feel like myself anymore.”

• “My memory isn’t what it used to be.”

• “I lose my train of thought.”

• “My fuse is shorter.”

• “I can’t focus.”

• “I feel mentally exhausted.”

• “My family says I’ve changed.”

For veterans and Special Operations personnel, these symptoms are often attributed solely to aging, PTSD, operational stress, or burnout.

The reality is that multiple factors may be occurring simultaneously.

Sleep disruption.Trauma.Chronic stress.Hormonal changes.Inflammation.TBI.Blast exposure.

The challenge is understanding how these factors interact.

Can CTE Be Diagnosed in Living Patients?

Historically, CTE could only be definitively diagnosed after death through neuropathological examination of brain tissue.

That is beginning to change.

Researchers at institutions such as the UCSF Memory and Aging Center and Boston University are actively working to identify biomarkers, imaging techniques, and diagnostic approaches that may eventually allow reliable diagnosis in living individuals.

Current research is exploring:

• Advanced PET imaging

• Blood biomarkers

• Cerebrospinal fluid markers

• Neuropsychological testing

• Digital cognitive assessments

While these tools remain investigational, the field is advancing rapidly and offers hope for earlier identification and intervention.

What Can Be Done?

At present, there is no cure for CTE.

However, there is growing evidence that supporting overall brain health may improve function and quality of life.

This may include:

• Sleep optimization

• Exercise

• Nutritional support

• Stress management

• Treatment of PTSD and depression

• Cognitive rehabilitation

• Occupational Therapy

• Brain-directed therapies

• Functional health approaches

While these interventions are not treatments for CTE itself, they may address many of the factors that contribute to poor brain health and reduced neurological resilience.

How We Can Help

At Brain Treatment Center NoVA, we work with veterans, Special Operations personnel, active-duty military, first responders, and individuals with histories of concussion, blast exposure, and traumatic brain injury.

Our comprehensive approach may include:

• qEEG Brain Mapping

• MeRT

• TMS

• Occupational Therapy (SPIN)

• Functional Health

• Counseling

• Integrative Brain Health Support

Our goal is not simply to manage symptoms.

Our goal is to help individuals better understand their brain health, optimize function, and support long-term neurological wellness.

Because when symptoms persist, it may be time to look deeper.

References

Lee, M. H., et al. (2024). Single-cell genomic analysis reveals extensive DNA damage and accelerated cellular aging in chronic traumatic encephalopathy. Nature Neuroscience, 27(3), 411–423.

McKee, A. C., Stein, T. D., Nowinski, C. J., Stern, R. A., Daneshvar, D. H., Alvarez, V. E., Lee, H. S., Hall, G., Wojtowicz, S. M., Baugh, C. M., Riley, D. O., Kubilus, C. A., Cormier, K. A., Jacobs, M. A., Martin, B. R., Abraham, C. R., Ikezu, T., Reichard, R. R., Wolozin, B. L., … Cantu, R. C. (2013). The spectrum of disease in chronic traumatic encephalopathy. Brain, 136(1), 43–64. https://doi.org/10.1093/brain/aws307

Stern, R. A., Adler, C. H., Chen, K., Navitsky, M., Luo, J., Dodick, D. W., Alosco, M. L., Tripodis, Y., Goradia, D. D., Martin, B., McKee, A. C., & colleagues. (2021). Tau positron-emission tomography in former National Football League players. New England Journal of Medicine, 384(18), 1716–1725.

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Chronic Traumatic Encephalopathy (CTE) is increasingly recognized as a potential consequence of repeated head trauma, concussion, and blast exposure. Learn how CTE may affect memory, mood, behavior, and long-term brain health, and explore brain-focused treatment options available for veterans, athletes, first responders, and individuals with a history of TBI in Northern Virginia.