Hepatocellular adenoma and hepatocellular carcinoma differ in benign and malignant nature, symptoms and pathogenesis. 1. Different benign and malignant nature: hepatocellular adenoma belongs to benign tumor in liver, while hepatocellular carcinoma belongs to malignant tumor with higher risk. 2. Different symptoms: patients with hepatocellular adenoma may have symptoms such as right upper abdominal pain, abdominal distension, nausea and vomiting, etc., while patients with hepatocellular carcinoma may have symptoms such as upper gastrointestinal bleeding, spider nevus, jaundice, etc. 3. Pathogenesis: Hepatocellular adenoma may be caused by the influence of drugs, androgens, genetic factors, etc. Hepatocellular carcinoma may be caused by hepatitis virus infection, alcohol, nitrosamines, aflatoxins, etc. It is suggested that patients should go to the hospital for medical treatment in time to avoid delaying the condition.