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 netimbangela letahlukahlukene letifanana nekulimala enhloko, lokungenteka nome ngabe ungakanani ngebudzala, kulimala nawubelekwa, njengekweswelakala kwemoyamphilo ngesikhatsi ubelekwa; kuchucha kwemkhuhlane, kuvuvuka kwebucopho incubulundvwana yasebuntfwaneni; kanye nekutsikameteka nome kungalingani kwenchubo yekusebenta kwemtimba nome yemakhemikhali emtimba.
