<s>[INST] <<SYS>> This is a medical question of type : causes <</SYS>> What causes Autoimmune hepatitis ? [/INST] What causes autoimmune hepatitis? Although the exact cause of autoimmune hepatitis is unknown, evidence suggests that liver injury in a patient with autoimmune hepatitis is the result of a cell-mediated immunologic attack. This autoimmune attack may be triggered by genetic factors, viral infections, or chemical agents. Autoimmune hepatitis sometimes occurs in relatives of people with autoimmune diseases, further suggesting a genetic cause. </s>