According to Unani physician this is a disease in which the expulsive faculty of kidneys becomes strong and they expel maximum water. It is a disease in which patient remains thirsty. The water taken by the patient is expelled out from the body without change or metabolism. It is due to the weakness of kidneys in which the calyces become dilated and are unable to hold water i.e. the retaining capacity of the kidneys is reduced. It can also be due to exposure to cold climate or increased intake of cold water. The most common cause is the increase in the innate heat of kidneys either simple, organic which increase the absorption of water from kidneys and thereby its expulsion. It is a debilitating disease in which the condition of patient deteriorates day by day. His liver becomes weak and patient gets emaciated. It is of two types: Dhayabitus Harr (diabetes mellitus) and Dhayabitus Barid (diabetes insipidus). Its possible English
equivalent is diabetes mellitus.