Nausea is not necessarily a precursor to liver cancer. Liver cancer may manifest nausea, but other diseases can also cause nausea. There are many causes of nausea, and the common ones are digestive diseases, such as acute and chronic gastroenteritis, peptic ulcer, reflux esophagitis and so on. Some neurological diseases, such as encephalitis, cerebral hemorrhage and cerebral embolism, may also cause nausea. In addition, some systemic diseases, such as hypertension, uremia, diabetic ketoacidosis, etc., can also cause nausea. In addition to the swelling and pain in the right upper abdomen, some patients with hepatocellular carcinoma may also have some clinical manifestations in the digestive tract, such as nausea, vomiting, acid reflux, abdominal distension and so on. If stubborn nausea occurs, one should go to the hospital for consultation in time in order to clarify the cause of the disease and then carry out targeted treatment according to the cause of the disease.