Liver cancer is not contagious, so the gas exhaled by patients with advanced liver cancer is not contagious. Liver cancer is a malignant tumor of digestive system caused by hepatitis virus, gene mutation, heredity and other factors. The main treatment after diagnosis of the disease is comprehensive treatment mainly based on surgical resection. Since liver cancer itself is not contagious, it is not contagious even in the advanced stage, not to mention that it is not contagious through exhaled breath. In advanced stage of liver cancer, distant metastasis usually occurs and the condition is more complicated. Therefore, in this period, patients are mostly treated by symptomatic therapy, targeted therapy, radiotherapy, chemotherapy and other non-surgical therapies, and the survival rate of five years after active treatment is about 5%. Attention should be paid to give more care and guidance to advanced cancer patients.