(1) Diabetes tends to run in families so it occurs in people who inherit the genes responsible for the insulin dependent form.
(2) Viral infection that damages the pancreas causing the deficiencyof insulin.
(3) Obesity is the major cause leading to development of non insulin dependent
diabetes.
(4) Severe illness such as pancreatitis and thyrotoxicosis causes diabetes.
(5) Intake of drugs like corticosteroid drugs and diuretic drugs.