Most documented cases have occurred in athletes with mild repetitive head impacts (RHI) over an extended period of time. Evidence indicates that repetitive concussive and subconcussive blows to the head cause<unk> . Specifically contact sports such as boxing, American football, Australian rules football, wrestling, mixed martial arts, ice hockey, rugby, and association football. In association football (soccer), whether this is just associated with prolific headers or other injuries is unclear as of 2017. Other potential risk factors include military personnel (repeated exposure to concussions charges or large caliber ordnance), domestic violence, and repeated banging of the head. The exact amount of trauma required for the condition to occur is unknown although it is believed that it may take years to develop.
Chronic traumatic encephalopathy
Parkinson's disease
Wernicke encephalopathy
Alzheimer's disease
Powassan encephalitis
Posterior reversible encephalopathy syndrome
Toxic encephalopathy
Viral encephalitis