Diabetes  mellitus is a disease caused due to the  excessive quantities of the sugar content in the blood and its excretion in the urine.The excessive elimination of the urine  (up to 30 to 40 litres per day) is the characteristic feature of another disease known as diabetes insipidus.The urine eliminating due to diabetes insipidus doesnot contain sugar content at any amount.The disturbance in the posterior end of the pituitary gland causes diabetes insipidus where as the  diabetes mellitus is associated with the non proper functioning of the islets of langerhans  an endocrine gland in the pancreas. The insulin  hormone is secreted by the islets of langerhans.The symptoms of diabetes include excessive urination , the very increase frequency in the urination process , loss of weight , excessive apetite , general weakness and excessive thirst.The diabetes patient drinks large quantity of water as he feels thirsty.The high level of blood sugar level is the  first obvious sign of diabetes. Another sign of the diabetes patient is the high sugar content in the urine.The treatment of diabetes include the injection of insulin in the body at proper intervals.The injection of insulin is not actually a cure but it is a method used for the control of diabetes. Drugs namely tolbutamide and daonil can be taken  orally for the control of this disease . for the comfortable life of a diabetic patient the two precautions to be taken are  administration of insulin  and weekly analysis of urine.The amount of insulin depends the health of diabetic  patient.