Diabetes mellitus : It is commonly called sugar disease. It is caused due to the lack of secretion of insulin.

Symptoms : The disease is characterised by the following:

1. Sugar in the urine.

2. Frequent urination.

3. Thirst increases.

5. Ketone bodies are formed and may be excreted with the urine.

6. Weakness.

7. Healing of the wound takes more time.