Diabetes mellitus is nothing but one type of disorder. It’s the sugar level will be increasing in the blood without control. Sugar controlled by insulin. But when it is stopping the sugar level will be increase in the blood. There are 2 main reasons. 1 is insulin is not secreting in the body. Second reason is the secreted insulin not utilizing properly there is some problem. Sugar level should be control immediately. We should give proper treatment for that disorder. We should follow diet, regular exercises. That is very essential for maintain sugar level. Diabetes mellitus in severe conditions produce some complications such as foot ulcer, eye problems, cataract, etc. Initial test is important. The lab tests such as blood test, that includes sugar level in before eating foods, and after eating foods, that should be monitor. And urine sugar also should monitor frequently. We should pay attention even small complaints. We should inject insulin regularly without discontinuing. Frequent monitoring, diet control, proper physician advices, regular exercises, weight control, medications are very essential.