If you have a hard lump in your stomach, it is recommended that you first register with the emergency department or general surgery. Hard lumps in the abdominal cavity commonly occur for reasons such as blockage of the abdominal cavity and intestines, especially in the colon, and are commonly seen in patients with chronic constipation, where the fecal masses remain in the intestines for long periods of time and are repeatedly compressed by the intestines and further ingested by the water within them, resulting in abnormally dry, hard fecal masses that are not easily eliminated. It may also be seen in inflammatory diseases of the abdominal cavity, such as acute appendicitis, forming a peripheral abscess, which is further encapsulated without spreading and forms a larger inflammatory mass, which will contain the appendix, surrounding intestinal tubes, omentum, peritoneum, etc., which gather into a mass with each other and are not easily pushed, are harder, and are often confused with malignant tumors in the abdominal cavity. For enlarged mesenteric lymph nodes, or larger malignant tumors in the abdominal cavity, a visit to the general surgery department is also required, and the relevant examination is preferably a CT of the abdomen, which has a higher sensitivity and diagnostic criteria.