Some conditions are more likely to appear at specific periods, for example post-natal depression in new mothers, mental deterioration (Dementia) in the elderly.
Ezinye iimeko zidla ngokuvela ngamathuba athile, umzekelo uxinzelelo lwengqondo oluvela emva kokubeleka kubadlezana, ukuguquguquka kwengqondo (ubugeza) ebantwini abalupheleyo.