2 – Sustained brain damage
Although amnesia is often caused by sudden trauma to the head — such as through a sports injury or traffic accident — memory loss can also be the result of sustained or consistent damage to the brain. This typically occurs in situations where the patient is regularly exposed to moderate head trauma that, in each scenario, does not result in amnesia but does lead to significant memory loss over a lengthy period of time.
This kind of amnesia is often associated with athletes playing particularly physical, even brutal, sports, such as boxing, mixed martial arts, football, hockey, or lacrosse. With every punch, kick or hit to the head, these athletes sustain slight though significant brain damage that can eventually result in memory loss and dementia.