The classical symptoms of type 1 diabetes include: polyuria (excessive urination), polydipsia (increased thirst), xerostomia (dry mouth), polyphagia (increased hunger), fatigue, and weight loss.
Many type 1 diabetics are diagnosed when they present with diabetic ketoacidosis. The signs and symptoms of diabetic ketoacidosis include xeroderma (dry skin), rapid deep breathing, drowsiness, abdominal pain, and vomiting.
About 12 percent of people with type 1 diabetes have clinical depression.
The cause of type 1 diabetes is unknown. A number of explanatory theories have been put forward, and the cause may be one or more of the following:
1. genetic susceptibility
2. A diabetogenic trigger
3. Exposure to an antigen.