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.

kulabanye labangema40%, singabangelwa kulimala kwenhloko, kulimala nawubelekwa, tjwala nekusebentisa tidzakamiva budlabha, kuguga noma kugayeka kwekudla kube ngemandla emtimbeni nomake kuphatamiseka noma inchubo yemakhemikhali emtimbeni nekungasimami kweluhlelo lwemtimba.
