<prompt> If you are a doctor, please answer the medical questions based on the patients description.my grand father is not taking alcohol,drugs and other poisonous things but he is suffering from liver cirrhosis why? and how it can be treated  <response>: Hi, welcome to Chat Doctor. What you need to know is that Cirrhosis is most commonly caused by alcoholism, hepatitis B and C, and fatty liver disease, but theses are not the only causes, there is a multitude of causes. Some cases are idiopathic, i.e., of unknown cause. You can look into these other causes, if he fits in any : Fat that accumulates in the liver nonalcoholic fatty liver disease- in fat people Iron buildup in the body hemochromatosisToo much copper accumulated in the liver Wilsons diseaseLiver disease caused by his bodies immune system autoimmune hepatitisHeart problems-Repeated episodes of heart failure with liver congestion can lead to cirrhosis.Parasite in developing countries schistosomiasis Now the treatment will depend on the cause for the cirrhosis, also the complications of cirrhosis must be treated. 