there can be a variety of underlying causes such as a head injury, that can occur at any age; a birth injury, such as a lack of oxygen during birth; fever convulsions, encephalitis, meningitis or childhood measles; and metabolic or biochemical disturbances or imbalances.

kungaba nembangela eyisisusa ehlukahlukene njengokulimala ekhanda, okungenzeka kunoma yisiphi isigaba sobudala; ukulimala ngesikhathi ubelethwa, okufana nokuswelakala kweoksijini eyanele ngenkathi ubelethwa; ukubophana kwamamasela okudalwa imfiva, ukuvuvukala kobuchopho, isifo solwembu lobuchopho noma isimungumungwana sobungane; kanye nokuphazamiseka noma ukungalingani komzimba noma kwamakhemikhali emzimbeni.
