The causes of stomach distension and pain in liver cancer include formation of ascites, gastrointestinal stasis, tumor compression and so on. 1. Ascites formation: patients with liver cancer often have portal hypertension, which can promote the formation of ascites. In addition, due to the decline of liver function, protein synthesis function of liver cancer patients decreases, resulting in hypoproteinemia, which also contributes to the formation of ascites. The formed ascites causes abdominal distension of patients. 2. Stagnation of blood in gastrointestinal tract: due to portal hypertension, patients with liver cancer have obstacle to blood return in gastrointestinal tract, which leads to blood stagnation in gastrointestinal tract, resulting in decline of digestive function of patients and abdominal distension of patients. 3. Tumor compression: when liver cancer is huge in size, it can pull the hepatic peritoneum, and patients can feel abdominal distension and pain. Besides, huge liver cancer can also compress gastrointestinal tract, leading to intestinal obstruction, gas accumulation in gastrointestinal tract, etc., and patients will suffer from abdominal distension. In addition, when liver cancer metastasizes to the digestive tract, it can make gastrointestinal peristalsis decrease and make patients feel abdominal distension. For patients diagnosed with liver cancer, they should go to relevant departments of regular hospitals as soon as possible for consultation and treatment by professional doctors, and try to achieve early detection, diagnosis and treatment, so as to avoid delaying the condition and leading to adverse consequences.