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Adults playing full-contact tackle football face significant, long-term health risks, most notably regarding brain injury and chronic, debilitating orthopedic trauma. While often considered a game for young athletes, adults participating in amateur or "pickup" tackle leagues are at high risk for permanent injuries, including chronic traumatic encephalopathy (CTE), due to the intense, high-velocity collisions involved. 

Key Health Risks

Chronic Traumatic Encephalopathy (CTE): This is a degenerative brain disease caused by repeated head impacts, not just concussions, which can lead to memory loss, confusion, impaired judgment, aggression, depression, and dementia.

Cumulative Brain Damage: Studies show that every additional year of playing football increases the odds of a CTE diagnosis by 15% and severe CTE by 14%. Brain damage can progress over decades, with symptoms often appearing 8-10 years after last contact.

Concussions & Second-Impact Syndrome: Concussions are common. If a player sustains a second head injury before the first has healed, they risk "second-impact syndrome," which can cause rapid, fatal brain swelling.

Orthopedic & Joint Damage: Contact sports cause significant wear and tear on cartilage, leading to early-onset arthritis and severe joint injuries, such as ACL tears, bone fractures, and dislocations.

Nerve Damage: Known as "burners" or "stingers," these injuries are common in collision sports, causing weakness and long-term, recurrent damage to the neck and shoulders. 

Factors Affecting Risk

Position: While all players are at risk, defensive backs, defensive linemen, and offensive linemen are often at the highest risk for injury due to the frequency of collisions.

Frequency of Contact: High-impact, full-contact practices are strongly linked to increased injury rates, with one study indicating that game injury rates are over 6 times higher than practice, but the majority of injuries still occur during high-contact practice, not just games.

Age Factor: While CTE is strongly linked to long-term exposure, starting before age 12 significantly increases the risk of earlier onset of cognitive, behavioral, and mood symptoms later in life. 

Long-Term Impact

Autopsy studies of former football players (ranging from high school to professional levels) have revealed alarming rates of CTE, with some studies finding it in nearly 90% or more of the brains analyzed. The risks are cumulative, meaning that sustained exposure to the sport results in worse long-term outcomes. 

Symptoms

There are no specific symptoms that have been clearly linked to chronic traumatic encephalopathy, also known as CTE. Some of the possible symptoms can occur in many other conditions. In people who were confirmed to have CTE at autopsy, symptoms have included cognitive, behavioral, mood and movement changes.

Cognitive impairment

Trouble thinking.

Memory loss.

Problems with planning, organizing and carrying out tasks.

Behavioral changes

Impulsive behavior.

Aggression.

Mood changes

Depression or apathy.

Emotional instability.

Substance misuse.

Suicidal thoughts or behavior.

Movement symptoms

Trouble with walking and with balance.

Shaking, slow movement and trouble with speech, known as parkinsonism.

Gradual loss of control of movements, such as walking, speaking, swallowing and breathing, known as motor neuron disease.

CTE symptoms don't develop right after a head injury. Experts believe that they develop over years or decades after repeated head trauma.

Experts also believe that CTE symptoms appear in two forms. In early life between the late 20s and early 30s, the first form of CTE may cause mental health and behavioral issues. Symptoms of this form include depression, anxiety, impulsive behavior and aggression. The second form of CTE is thought to cause symptoms later in life, around age 60. These symptoms include trouble with memory and thinking that is likely to progress to dementia.