There is a hard lump under the belly with pain when pressed, which may be related to abdominal wall fibroma, sebaceous cyst, intra-abdominal tumor and other reasons. 1. Abdominal wall fibroma: unclear boundary, hard, inactive, most of them have no obvious symptoms, and may have pain when pressed. 2. Sebaceous cysts: sebaceous secretions can not be discharged from the glands and accumulate under the skin to form cysts, which are usually soft and non-tender. When accompanied by infection, the texture becomes hard, and obvious tenderness may appear. At the same time, the skin in the area is red and swollen, the skin temperature is high, and an abscess may appear in the later stage. 3. Abdominal or pelvic tumors: such as intestinal tumors, pelvic tumors, etc. If the tumor is large, hard lumps may be touched in the belly, and there may be pain when pressed. It is suggested that those who have a hard lump under the belly and have pain when pressed should go to the hospital in time to clarify the cause of the disease and carry out standardized treatment under the guidance of the doctor.