A hard feeling inside the stomach may be a tumor growing in the abdominal cavity, which needs extra attention. First of all, you can conduct a physical examination by yourself, lying flat on the bed, after bending your legs, press the abdomen with your hands and conduct a clockwise physical examination from the upper abdomen to both sides of the abdomen. If a lump can be touched and the texture is very hard, the location, size and mobility of the lump should be determined first. Secondly, timely examination at the hospital is required. First, CT of the abdomen is needed to understand the origin, texture, and boundary of the mass. If it is suspected to be of gastrointestinal origin, gastroscopy is also needed. If abnormalities can be found inside the gastrointestinal tract, tissue should be taken for pathological examination to further determine the benignity and malignancy of the tumor. If a mass appears in the abdominal cavity, it needs to be removed regardless of whether it is benign or malignant. If the mass is benign, simple excision is sufficient. If it is a malignant tumor, radical tumor surgery is required, which means that when the mass is removed, the lymph nodes inside the area should also be cleared.