When cancer is advanced, it may lead to gastrointestinal metastasis and intestinal obstruction, which may result in the inability to pass stool. If intestinal obstruction is a serious condition, conservative treatment of intestinal obstruction or surgery may be needed, but surgery is only a palliative surgery for enterostomy and cannot treat advanced cancer. In some cases of advanced cancer, the bowel movement is slow or the patient eats less, which may make the stool more difficult to solve. It is necessary to apply laxatives, such as lactulose and phenolphthalein tablets, which can laxify the bowels. At the same time, we need to pay attention to a small amount of water, and eat fresh vegetables and fruits rich in fiber, which can also help defecate. You can eat two bananas and drink a glass of yogurt every day. However, many patients with advanced cancer seldom eat or drink water because they have no appetite and have difficulty in defecating, so they can also try to apply enemas.