Hayden Hurst, a football player for the Carolina Panthers, has been diagnosed with post-traumatic amnesia after sustaining a concussion on Nov. 9.

The tight end's father, Jerry Hurst, tweeted Wednesday evening that his son had been evaluated by an independent neurologist and diagnosed with the condition after a significant head injury during the fourth quarter in a game against the Chicago Bears.

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Although PTA does not have a singular medical definition, the term is widely used by neurologists to guide decision-making during treatment.

PTA is diagnosed after a period of unconsciousness or concussion when the patient has no continuous memory of day-to-day or recent events. Patients with PTA may recognize loved ones but be unable to remember short-term events prior to and after the incident.

The condition can be temporary, lasting only minutes or hours after the injury. In more severe cases, PTA can last for several weeks or months after the injury.

Traumatic brain injury of any kind can result in a variety of mood and behavioral disturbances, particularly instances of agitation and aggression. Other cognitive functions, including attention and reasoning, are also symptoms of TBI and PTA.

National Football League officials responded to inquiries from sports reporters in November, saying that Hurst had been evaluated on the sidelines during the game by medical staff.

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"Concussion symptoms presented themselves following the game and the team appropriately placed him in the concussion protocol," league officials said in a statement. "It is not uncommon for symptoms to arise following a game."

"Slow recovery, don’t know when he’ll be back," Jerry Hurst said Wednesday.