in the other 40%, it can be caused by a head injury, injury during the birthing process, alcohol and drug abuse, aging or a metabolic or biochemical disturbance or imbalance.

kulaba abanye abanga ma40%, singabangelwa ukulimala ekhanda, ukulimala ngesikhathi sokubelethwa, utshwala kanye nokusebenzisa izidakamizwa, ukuguga noma ukuphazamiseka noma ukungalingani kwendlela yokwakheka komzimba noma kwamakhemikhali emzimbeni.
