<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing some symptoms lately. I have noticed melena, stiffness or tightness in my hands or fingers, incontinence of stool, and I have a history of drug abuse. What could be causing these symptoms?  <response>: Based on the symptoms youve described, it is possible that you may be suffering from viral hepatitis. 