In normal people, the abdominal muscles are soft, but if the stomach is hard when pressed, there may be a mass in the abdominal cavity, or a mass that appears hard on the surface of the body. You can first come to the hospital for a routine physical examination to find out the size of the mass, consider what part of the mass is formed, and also need to perform abdominal CT, or enhanced CT to examine. The location, size, border, texture, and whether the mass is benign or malignant will be determined. If the mass is in a parenchymal organ, such as the liver or kidney, the decision to operate should be based on the CT scan. If the mass is in the stomach or colon, gastroscopy or colonoscopy is required to obtain pathology to further clarify the nature of the mass. If the mass is benign, the decision to operate will be based on the condition of the mass. If the mass is malignant, surgery is definitely needed.