If there is a hard lump under the xiphoid process without pain, it is mostly considered to be caused by the hypertrophy of the xiphoid process itself, pyloric obstruction, sebaceous cyst, stomach cancer and other factors. 1. Hypertrophy of the xiphoid process: if the cartilage of the xiphoid process is longer or more hypertrophied, it is easy to have a hard lump without pain. 2. Pyloric obstruction: due to the narrow pylorus, the stomach contents can not pass through to reach the intestines, thus expanding in the stomach, resulting in distension of the epigastric region and movement of the mass, and the appearance of a hard lump under the xiphoid process but not painful. 3. Sebaceous cyst: As the sebum secreted by sebaceous glands in the area of raphe is not discharged from the mouth of hair follicles normally, it accumulates in the glands to form localized cysts, which results in the appearance of a hard but painless lump. 4. Gastric cancer: Due to the imbalance of cell growth in the stomach lining, if it enters into the lymphatic system, it is easy to form lymph node metastasis and spread to the outside of the stomach through the blood pathway; if the tissues in the region of raphe are infected, it is easy to have a hard lump but without pain. If the above situation occurs for a long time, it is recommended to go to the hospital in time for a detailed examination to clarify the cause of the disease and then give targeted treatment.