Whether long-term abdominal distension is cancer or not depends on the specific situation and cannot be generalized. Abdominal distension is the accumulation of things or gas in the lumen of the gastrointestinal tract, which causes the gas in the gastrointestinal tract not to be expelled smoothly and causes a feeling of stuffiness and distension in the abdomen. There are many reasons for abdominal distension, such as indigestion, irregular eating, and eating food that is not easily digested, which can lead to a decrease in the peristaltic capacity of the gastrointestinal tract and the phenomenon of abdominal distension. Abdominal distension is also seen in excessive gas production in the intestine caused by improper eating and intestinal obstruction causing intestinal dysplasia. In addition, ovarian cancer, colorectal cancer and liver cancer can also cause patients to suffer from prolonged abdominal distension and need to be alerted. Cancer patients may be accompanied by unexplained weight loss, abdominal pain and other symptoms. It is recommended that people with long-term abdominal distension should go to the gastroenterology department of a hospital for relevant examinations and symptomatic treatment in a timely manner to avoid delaying the condition.