The main reasons for diarrhea in liver cancer patients may be intestinal infection, digestive function decline, cancer gastrointestinal metastasis, etc., as follows: First, intestinal infection: the immunity of liver cancer patients is obviously reduced, and they are prone to various infections, if intestinal infection occurs, it will manifest as diarrhea, which may be accompanied by other symptoms such as fever and vomiting. Secondly, decreased digestive function: Gastrointestinal system congestion leads to decreased digestive function. Most liver cancer patients have cirrhosis and portal hypertension, which lead to gastrointestinal stasis and decreased digestive function, and if they eat improperly, it will lead to diarrhea, which may be accompanied by abdominal distension, acid reflux and other indigestion symptoms. Thirdly, gastrointestinal metastasis: although liver cancer rarely metastasizes to the gastrointestinal tract, metastatic cancer in various parts of the body may occur in late stage patients.