Surreal illustration of a soldier's helmet symbolizing the connection between brain injury and mental health.

Hidden Wounds: Understanding the Link Between Mild Traumatic Brain Injury and Suicidality

Avery Sinclair in Health & Wellness October 2026 • 5 min read.

"Research highlights the increased risk of suicidal thoughts and behaviors following multiple mild traumatic brain injuries, emphasizing the need for targeted support and awareness."

The complex relationship between traumatic brain injuries (TBIs) and mental health outcomes is an area of growing concern, particularly among military personnel. A study published in JAMA Psychiatry by Bryan and Clemans explored the correlation between repeated mild traumatic brain injuries (mTBIs) sustained in combat and the elevated risk of suicidal thoughts and behaviors. This research underscores the importance of understanding the long-term consequences of even seemingly minor head injuries on an individual's psychological well-being.

While the immediate physical effects of a TBI are often apparent, the subtle neurological and psychological changes that can occur, especially with repeated injuries, may be less obvious. These changes can manifest as impulsivity, altered emotional regulation, and increased vulnerability to mental health disorders like posttraumatic stress disorder (PTSD), all of which can contribute to suicidality. The original study found a link between the number of mTBI episodes and the likelihood of suicidal ideation, reinforcing the need for proactive screening and support for individuals with a history of head injuries.

This article delves into the key findings of the JAMA Psychiatry study and related research, highlighting the connection between mTBIs and suicidality. It addresses the potential role of factors like loss of consciousness (LOC) during injury and impulsivity, and emphasizes the critical need for increased awareness, early intervention, and comprehensive support systems for those at risk. By understanding the nuances of this relationship, we can work toward better protecting the mental health and well-being of individuals who have experienced traumatic brain injuries.

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Stats & Impact

TBI and Suicide Risk

A study in a Chinese cohort set out to examine the association between traumatic brain injury and suicide risk. Its authors report that patients with TBI have higher-than-normal rates of non-fatal deliberate self-harm, suicide, and all-cause mortality. The source snippet does not provide a figure for those rates.

Standard Approach

Measuring TBI and Suicide Risk

One described approach to measuring TBI uses an estimate of the duration of altered or lost consciousness (LOC) and/or post-traumatic amnesia (PTA). PTA is the period after injury during which the survivor cannot form new memories. A 2026 review of TBI and suicide highlights the need for further research, especially in civilian populations.

History

Documented TBI History Among Suicide Decedents

A study examining suicide decedents with a documented TBI history covered the period from 2003 to 2017. It identified 203,157 suicide decedents, of whom 993 had a documented TBI before suicide. Among those with documented TBI, a higher percentage were White non-Hispanic.

The Link Between mTBI and Suicidality: What the Research Shows

Surreal illustration of a soldier's helmet symbolizing the connection between brain injury and mental health.

The original study by Bryan and Clemans, as well as subsequent letters to the editor in JAMA Psychiatry, highlights several key findings regarding the relationship between mTBI and suicidality:

Increased Risk with Repeated Injuries: The more mTBI episodes an individual experiences, the higher the likelihood of suicidal thoughts and behaviors. This suggests a cumulative effect of brain injury on mental health.

Loss of Consciousness (LOC): There is a question of whether mTBI episodes with LOC are more strongly associated with suicidality compared to those without LOC. Some research suggests that the relationship between PTSD and the number of mTBI episodes is stronger when LOC is involved.
Impulsivity: Impaired impulse control following mTBI may play a significant role in suicidal behavior. Individuals may enter a suicidal state following an unexpected setback, acting impulsively without expressing distress beforehand. This impulsivity can be a reflection of altered frontal lobe function.
Prefrontal Cortex Injury: The prefrontal cortex, responsible for executive functions like decision-making and impulse control, may be particularly vulnerable in mTBI. Impaired olfaction, linked to the ventromedial prefrontal cortex, could indicate prefrontal injury.

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Latest Research

Military TBI, Mental Health, and Suicide Risk

Research on military-related TBI and new-onset mental health conditions and suicide risk includes interview findings about how symptoms are attributed. Interviewees described fluid boundaries between events causing physical or emotional injury and later symptoms, which they associated with mTBI, PTSD, or both. Soldiers also highlighted the compounding effects of experiences and symptoms over one or more deployments.

Counterpoints

Limits on Causal Conclusions

A systematic review identifies associations between TBI and suicide risk factors but says it is challenging to establish causal relationships. The review attributes this challenge to the multifactorial nature of suicide. Its findings therefore describe associations rather than establishing that TBI causes suicide.

Comparison

Concussion and Subsequent Suicide Risk

A systematic review and meta-analysis found a two-fold higher risk of subsequent suicide among more than 700,000 people diagnosed with concussion and/or mild TBI. The comparison group included more than 6.2 million individuals who had not received those diagnoses. These are the group sizes and relative risk reported in the study snippet.

These findings collectively point to a complex interplay between brain injury, psychological factors, and increased suicide risk. The observation that repeated traumatic brain injury events are associated with increased risk of suicidality suggests that such individuals, their families, and caregivers should be targeted for interventions to prevent suicide. Families need education about mTBI to understand that even though the veteran may not have visible injury that mTBI may produce behavioral changes including suicidality.

Taking Action: Resources and Support for Individuals with mTBI

The research underscores the importance of proactive interventions to prevent suicide among individuals with a history of mTBI. These interventions should include:

Education: Educating veterans, their families, and caregivers about the potential long-term effects of mTBI on mental health is crucial. This includes raising awareness about the signs and symptoms of depression, PTSD, and other mental health conditions that may increase suicide risk.

Early Intervention: Encouraging veterans to seek help at the first sign of suicidal thoughts or distress is essential. This may involve connecting them with mental health professionals, support groups, or crisis hotlines. Families should also be educated on how to recognize warning signs and how to intervene effectively.

How the reported risk figures compare

95%A concussion history was associated with odds ratios of 1.35 for suicidal ideation (95% CI 1.20–1.52), 1.35 for making a suicide plan (1.20–1.51), 1.66 for attempted suicide (1.43–1.94), and 1.90 for death by suicide (1.59–2.27). These are odds ratios, not absolute probabilities.^[1]
8.2%In the first year after TBI, reported rates were 8.2% for suicidal ideation and approximately 3.0% for suicide attempts; the source describes these as similar to or higher than general American population rates in that timeframe.^[2]
6.72Among high-VHA-utilization veterans, odds of intentional self-harm, compared with veterans diagnosed with neither TBI nor PTSD, were 6.72 for comorbid TBI/PTSD, 3.21 for PTSD alone, and 2.81 for TBI alone.^[3]
25%Lifetime prevalence estimates for suicidal thoughts in unselected samples were 15–25%. This is a lifetime measure, unlike the first-year post-injury rates above.^[4]

What the comparisons show-and leave uncertain

The reported associations span thoughts, planning, attempts, and suicide deaths, but odds ratios do not by themselves tell how likely an individual is to experience any outcome. The first-year rates and lifetime estimates also describe different time windows, so they should not be read as direct comparisons.^{[1] [2] [4]}

In the veteran comparison, the highest odds occurred where TBI and PTSD diagnoses co-occurred. Small differences in assessed risk factors suggest that any added risk linked to mTBI in veterans with PTSD may instead reflect, or be confounded by, PTSD symptom severity.^{[3] [5]}

For chronic traumatic encephalopathy (CTE), the overall evidence connecting the condition with suicide was rated very low quality. That rating limits how firmly the relationship can be interpreted.^[6]

How symptoms and measurement complicate comparisons

Military interview findings describe symptom boundaries as fluid: experiences and later symptoms could be attributed to mTBI, PTSD, or both. Soldiers also described experiences and symptoms compounding across deployments, making a single cause difficult to isolate.^[7]

TBI-related symptoms can differ from person to person, including among people whose injuries have similar severity. A severity label therefore does not imply a uniform symptom profile.^[8]

Estimates of blast-related mTBI burden are difficult to establish because definitions vary, definitive objective tests are lacking in operational settings, and PTSD or other neuropathological conditions may overlap or co-exist.^[9]

What remains unresolved about injury and suicide

How well can a Glasgow Coma Scale score represent injury severity when it is described as a crude assessment with debatable clinical utility, and brain damage may accompany even mild closed head injury?^[4]
Could impaired affective control help explain prospective links between TBI and suicidal or other psychopathological phenomena, and how can that mechanism be distinguished from overlapping conditions?^{[4] [9]}

Sources

Risk of suicidal behaviors following sport-related and non-sport-related concussion: a systematic review and meta-analysis (pmc.ncbi.nlm.nih.gov)
The Relationship Between Traumatic Brain Injury and Suicide: A Systematic Review of Risk Factors (pmc.ncbi.nlm.nih.gov)
Intentional Self-Harm Among US Veterans With Traumatic Brain Injury or Posttraumatic Stress Disorder: Retrospective Cohort Study From 2008 to 2017 (pmc.ncbi.nlm.nih.gov)
Suicide Following Traumatic Brain Injury: Pathogenesis and Neurocognitive Mechanisms | IntechOpen (www.intechopen.com)
Does a history of mild traumatic brain injury increase suicide risk in veterans with PTSD? (pubmed.ncbi.nlm.nih.gov)
Chronic Traumatic Encephalopathy and Suicide: A Systematic Review (pmc.ncbi.nlm.nih.gov)
Associations of Military-Related Traumatic Brain Injury With New-Onset Mental Health Conditions and Suicide Risk (pmc.ncbi.nlm.nih.gov)
Traumatic Brain Injury and PTSD - PTSD: National Center for PTSD (www.ptsd.va.gov)
Characteristics and Impact of U.S. Military Blast-Related Mild Traumatic Brain Injury: A Systematic Review (pmc.ncbi.nlm.nih.gov)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

How do multiple mild traumatic brain injuries impact the risk of suicide?

Multiple mild traumatic brain injuries (mTBIs) increase the likelihood of suicidal thoughts and behaviors. The study by Bryan and Clemans, published in JAMA Psychiatry, found a direct correlation: the more mTBIs an individual experiences, the greater the risk of suicidality. This suggests a cumulative effect where repeated brain injuries negatively impact mental health. The implications are significant, urging proactive screening and support for those with a history of head injuries to mitigate suicide risk.

Does the presence of loss of consciousness (LOC) during a mild traumatic brain injury affect suicide risk?

The potential involvement of Loss of Consciousness (LOC) during a mild traumatic brain injury (mTBI) is significant. Some studies suggest a stronger association between PTSD and the number of mTBI episodes when LOC is involved. This suggests that the severity or nature of the injury, as indicated by LOC, might influence the likelihood of later suicidal ideation. This has implications for how the symptoms and effects are assessed and addressed after a head injury.

How can impulsivity influence the link between mild traumatic brain injury (mTBI) and suicide?

Impaired impulsivity can follow mild traumatic brain injury (mTBI) and significantly raise the risk of suicidal behavior. Individuals with mTBI may struggle with impulse control, leading to impulsive actions, including suicide attempts. This can result from changes in the frontal lobe function which manages executive functions, including decision-making and impulse control. This means individuals may have little or no warning signs or expressed distress before attempting suicide, emphasizing the importance of intervention.

What is the significance of the prefrontal cortex in mild traumatic brain injury (mTBI) and suicide risk?

The prefrontal cortex plays a crucial role in the context of mild traumatic brain injuries (mTBIs). This area is responsible for critical executive functions, including decision-making and impulse control. Injury to the prefrontal cortex during an mTBI can lead to impairments in these functions, potentially contributing to suicidal behavior. Impaired olfaction, connected to the ventromedial prefrontal cortex, could indicate prefrontal injury. Understanding this allows for better diagnosis and targeted treatments for those with mTBIs.

What steps can be taken to support individuals with mild traumatic brain injury who are at risk of suicide?

Those with a history of mild traumatic brain injury (mTBI) need proactive interventions to prevent suicide. Interventions should include increased awareness, early intervention, and comprehensive support systems. This approach involves education, screening, and access to mental health services tailored to address the specific challenges faced by individuals with mTBIs. Early intervention could involve immediate support and the building of safety plans for those at risk, potentially reducing the incidence of suicide. Comprehensive support includes family education and long-term mental health treatment.