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Long-Term Effects of Untreated Concussions

Written by Dormer Harpring reviewed by KC Harping. September 19, 2025Personal Injury

What happens if a concussion goes untreated in Colorado? The consequences can extend far beyond the initial injury, affecting physical health, cognitive function, and emotional stability. Persistent headaches, memory problems, slowed thinking, and mood disorders such as anxiety or depression are common long-term effects. In more severe cases, untreated concussions may even lead to seizures or raise the risk of future brain disorders. For individuals in Denver, these health concerns also carry legal implications. Colorado law requires injured parties to take reasonable steps to limit their damages by seeking medical care. When treatment is delayed, insurance companies may argue that the harm could have been avoided, reducing or denying fair compensation. At Dormer Harpring, our attorneys help clients link their medical records with their legal claims, ensuring the full scope of their suffering is recognized and addressed.

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Post-Concussion Syndrome

What Is Post-Concussion Syndrome?

Post-concussion syndrome (PCS) describes a condition where concussion symptoms last far longer than expected. Most people recover from a head injury within several weeks. However, when a concussion goes untreated, lingering effects can disrupt physical health, cognition, and emotional stability. This raises a serious concern that many ask: Can an untreated concussion kill you? While death is uncommon, the risks of permanent damage or secondary complications make early treatment essential.

PCS can involve a wide range of symptoms, such as:

  • Headaches that persist or worsen.
  • Cognitive impairment, such as memory loss or “brain fog.”
  • Fatigue and low energy.
  • Sleep disturbances like insomnia or oversleeping.
  • Dizziness or balance problems.
  • Visual issues such as sensitivity to light.
  • Mood changes, including anxiety or irritability.

According to medical research summarized by the Mayo Clinic, neurological changes after a head injury can extend for weeks or months, underscoring the importance of prompt care.

Second-Impact Syndrome

A second head injury before the first concussion heals can result in rapid, often fatal brain swelling. This rare but catastrophic condition, known as second-impact syndrome, disproportionately affects adolescents and athletes. Prompt diagnosis and rest are essential to avoid compounding damage.

Chronic Traumatic Encephalopathy (CTE)

While not always the result of a single untreated concussion, repeated head trauma significantly raises the risk of Chronic Traumatic Encephalopathy (CTE)—a degenerative brain disease. As noted by the Mayo Clinic, symptoms can include:

  • Progressive memory loss
  • Impaired judgment and impulse control
  • Aggression and depression

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Increased Risk of Future Brain Disorders

Epilepsy

Untreated concussions increase the likelihood of developing epilepsy. Brain trauma disrupts electrical activity, and these disruptions may lead to seizure disorders that affect work, driving, and long-term independence.

Alzheimer’s and Parkinson’s Disease

Research suggests a link between brain injuries and neurodegenerative conditions. Repeated or untreated concussions raise the risk of Alzheimer’s or Parkinson’s disease later in life.

Seizures

Seizures may appear as a delayed consequence of brain trauma. They not only limit daily functioning but also carry safety risks.

Increased Risk of Repeat Concussions

Failure to treat an initial concussion increases your vulnerability to subsequent injuries. The brain remains in a weakened state, and even minor trauma may trigger worsened symptoms or permanent deficits.

Further Damage and a Longer Recovery Time

Most concussions heal completely in approximately two weeks. However, healing from a concussion requires the proper amount of rest during the recovery period. The brain needs rest so that it can repair the cells and tissues that were damaged from the injury. If a victim is not diagnosed with a concussion, he or she may not take the proper steps toward recovery.

Failing to treat the injury could lead to worsened or longer-lasting symptoms, which may include headaches, dizziness, sensitivity to light or noise, and mood swings. In some cases, a victim may experience post-concussion syndrome, which is when the symptoms of a concussion continue much longer than the average time – for some patients, months or even years after suffering the head injury.

Emotional Effects

Mood Changes

Mood swings, anxiety, and depression often follow untreated concussions. These emotional shifts can interfere with relationships, professional responsibilities, and overall quality of life.

Increased Risk of PTSD

A head injury can worsen the risk of developing post-traumatic stress disorder (PTSD). Accident victims in particular face heightened vulnerability.

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Cognitive Effects

Memory Loss

Both short-term and long-term memory can be impaired following an untreated concussion. This may affect employment, education, and everyday independence.

Slowed Thinking

Processing speed may drop significantly. Victims often describe feeling mentally “slowed down,” which complicates decision-making.

Difficulty Concentrating

Sustained focus can become difficult. For students, professionals, or anyone managing daily tasks, this lack of concentration is a major obstacle to recovery.

Physical Effects

Chronic Headaches

Headaches that continue for months or years are a hallmark of untreated concussions. They can become debilitating, requiring medical treatment and ongoing care.

Dizziness and Balance Issues

Balance and coordination often remain impaired after a concussion. Victims may struggle with walking, driving, or even performing household tasks.

Sleep Disturbances

Persistent sleep problems, insomnia, or excessive fatigue are frequently reported. Poor rest worsens other symptoms, such as headaches and mood changes.

Exercise Intolerance

Many survivors notice they cannot tolerate physical exertion. Even light activity may trigger headaches, dizziness, or overwhelming fatigue, showing the injury has not fully healed.

How Can Delaying Medical Care Affect a Brain Injury Claim?

While your physical health and wellness are most important, leaving a concussion untreated can also negatively affect your ability to recover fair financial compensation for your brain injury. For example, if you attempt to file a brain injury claim, an insurance company may blame you for the extent of your symptoms if you were not seen by a medical professional or did not receive treatment right away. Our Denver brain injury lawyers are equipped to handle these cases.

It is critical to take any type of head injury seriously after an accident in Colorado. If you hit your head in a car crash or slip and fall, for example, see a doctor immediately. If you have a concussion, the injury needs to be diagnosed promptly so that you can get the proper treatment or amount of rest. Leaving a concussion untreated can interfere with your brain’s ability to heal as well as hurt your chances of qualifying for financial compensation from an insurance claim.

Sean Dormer

Denver Personal Injury Attorney
Fighting for Justice, Winning Against the Odds

Sean Dormer has built his career on standing up to powerful corporations and insurance companies to get justice for the injured. With a relentless trial-focused approach, he has secured multi-million-dollar verdicts and settlements for clients who were turned away by other firms. His expertise has led him to speak at statewide legal conferences and advocate for fairer personal injury laws in Colorado.

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This page has been written, edited, and reviewed by a team of legal writers following our comprehensive editorial guidelines. This page was approved by attorney, K.C. Harpring, a Denver personal injury attorney with extensive legal expertise.