There are the medical dangers of football in general caused by head trauma over repetitive hits.
He was diagnosed posthumously with chronic traumatic encephalopathy, a disease caused by repeated head trauma.
Not everyone who is exposed to repeated head trauma would develop the disease, experts say.
This form of brain damage has been increasingly diagnosed by symptoms in athletes subjected to head trauma.
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The report showed Seau had CTE, a brain disease linked head trauma, which can lead to depression.
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It can also be caused by chronic sinusitis, head trauma from an accident or the common cold.
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When the discovery of the bones was announced, it was confirmed they showed signs of major head trauma.
During Jack's rescue, an Orange County volunteer deputy sheriff "sustained head trauma" after falling 60 feet, the sheriff's department lieutenant said.
The military is using sensors on vehicles and body armor that can detect environmental changes and head trauma.
The suit alleges a long history of coverup by the NFL about the effects of the game's head trauma.
Head trauma in current and retired players remains a fly in the ointment.
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Upper respiratory infections, pollution, head trauma and diseases including diabetes all have the potential to compromise our sense of smell.
They can cause electrical burns, strangulation, tripping, and serious head trauma from appliances being pulled down by little hands or feet.
"My brother received such head trauma that ... there was no hope for him, " Bowley's sister, Donna Burleigh, said in court.
Duerson's ex-wife said that while playing professionally, the head trauma he bore on the field would become plain after games ended.
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After his arrest, Mr. Stanford claimed that his memory was impaired by head trauma from a prison beating he suffered in September 2009.
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In both cases, Easterling and Duerson exhibited symptoms of repetitive head trauma: memory lapses, anger and deep depression, according to family and friends.
And other cynics would wonder about the timing of this initiative, what with a pending head trauma-related lawsuit from more than 4, 000 ex-players.
He was 62, and an autopsy found that he had the degenerative brain disease CTE, thought to be caused by head trauma.
Dorsett, who is also battling memory loss, says that the league should have done more to warn players about the consequences of head trauma.
After a head trauma, there may be multiple severe intraparenchymal hematomas.
There's such strong evidence correlating head trauma and collisions and CTE.
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His younger brother Chelone, 22, was in hospital after suffering "extensive head trauma" when his motorcycle crashed near the family home in New Hampshire last Thursday.
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He left a note to send his brain for use in the ongoing study of the effect of concussions and head trauma on depression and suicide.
Attorneys representing Lewis and Levens accuse the league of having used a "hand-picked committee of physicians" to misrepresent evidence of the effects of head trauma, particularly concussions.
As he probably suspected, the research revealed he had the type of head trauma from repeated hits that can lead to depression, which can lead to suicide.
He would, however, like to donate his brain to Boston University and its School of Medicine and Sports Legacy Institute, which studies brain disease and head trauma.
The spokeswoman added that the child had been transferred to Frenchay Hospital as he was suffering from head trauma and the hospital has a specialist major trauma unit.
On the other hand, it is absolutely true that head trauma -- when severe -- can completely change a person's ability to think, feel and accurately perceive reality.
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Today's coaches, trainers, and players are much more aware of the severity of head trauma than those of a decade ago, but some say it's too little too late.
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