NEW : Researchers find start of brain damage in 18-year old athlete who died . NEW : `` I read [ every study I could find ] and I realized there was a ton of evidence showing concussions lead to depression , and multiple concussion can lead to Alzheimer 's . '' Same type of brain damage found in sixth dead NFL player . Comment: Symptoms can include depression , sleep disorders , headaches .
NEW : Researchers find start of brain damage in 18-year old athlete who died . NEW : Same type of brain damage found in sixth dead NFL player . Comment: Symptoms can include depression , sleep disorders , headaches .