That 's where the problems started , '' said Johnson , who retired after those two concussions . AP : Researchers found start of brain damage in an old man who died . NEW : Same type of brain damage found in sixth dead football player . Damage from repeated trauma is called chronic traumatic encephalopathy . Symptoms can include depression , sleep disorders , anxiety .
AP : Researchers found start of brain damage in an old man who died . NEW : Same type of brain damage found in sixth dead football player . Damage from repeated trauma is called chronic traumatic encephalopathy . Symptoms can include depression , sleep disorders , anxiety .