A hard lump inside the small stomach is commonly caused by the following: first, body surface swelling, such as sebaceous cysts, lipomas, fibroids, which requires further improvement of relevant examinations, such as ultrasound, at the hospital. If it is considered a common benign swelling, it can be observed regularly. If it is some infectious disease, it needs to be surgically removed. Second, it may be a muscle growth of the abdominal wall, such as myofibroma or leiomyosarcoma, etc., need to go to the hospital orthopedics or abdominal wall surgery as soon as possible to improve the relevant examination, if necessary, surgery to remove. Third, it may be caused by intra-abdominal growths, such as colon cancer, which need to be clarified by abdominal CT and colonoscopy as soon as possible. Some patients are also caused by abdominal wall hernia, which also need to check the abdominal ultrasound or abdominal CT, if the disease, need to perform surgical treatment to solve the problem.