A mass inside the stomach is seen in the following two cases: first, in elderly patients who are bedridden for a long time and have a history of habitual constipation, if there is difficulty in defecation, the investigation will reveal an abdominal mass, especially in the left lower abdomen in the sigmoid colon area considered to be a fecal mass in the intestinal canal. Second, the occupying lesions in the abdominal cavity, and specifically include benign tumors as well as malignant tumors. Malignant tumors mostly occur in the gastrointestinal tract, including colorectal cancer or gastric cancer; they can also occur in the pancreas, mainly malignant tumors, and some patients have pancreatic pseudocysts formed secondary to trauma; some patients have gynecological diseases, mainly ovarian cysts. After the diagnosis of these diseases, surgery should be performed in a timely manner, and pathological examination should be performed after the surgery.