The manifestation of drowsiness in patients with advanced liver cancer can be caused by malignant disease, hepatic encephalopathy and other factors, which usually means that the disease is more serious and mostly belongs to bad signs. Liver cancer is a common malignant tumor, which is caused by various factors such as hepatitis virus, alcohol and heredity. Due to the depletion of the tumor on the patients, patients in the advanced stage can mostly have the manifestation of malignant disease, which leads to the manifestation of fatigue, tiredness, laziness, drowsiness and so on. In addition, due to liver function failure caused by liver cancer, patients can be induced to develop hepatic encephalopathy, which also becomes hepatic coma. At this time, in addition to the symptoms of drowsiness, fluttering tremor, personality change and other symptoms may also appear. At this time, attention should be paid to controlling protein intake, avoiding constipation and so on. It is recommended that the patient should clarify the cause of the disease in time and treat the patient accordingly.