Hard lumps in the middle of the stomach may be caused by poor digestion that prevents the timely discharge of feces, or intestinal tumors, lipomas and other diseases. 1. Indigestion: If there is slow intestinal peristalsis, indigestion may occur so that the feces can not be discharged in time and accumulate in the stomach for a long time, resulting in hard lumps. 2. Intestinal tumor: the middle of the stomach includes duodenum, ileum, colon and so on, if there is a tumor in these parts, hard lumps in the middle of the stomach will also occur, and there will also be diarrhea, abdominal pain and other symptoms. 3. Lipoma: If there is a hard lump in the lower layer of the abdominal skin, it may also be lipoma, etc. At this time, there will not be obvious digestive function abnormality. If the situation of hard lumps in the middle of the stomach persists and cannot be relieved, it is recommended to go to the hospital in time to improve the relevant examination, and carry out reasonable treatment under the guidance of the doctor, so as to prevent the delay of the condition.