A large sarcoma growing in the stomach may be caused by lipoma, dermatofibroma and other factors. 1. Lipoma: After the abnormal proliferation of abdominal fat cells, granular fluid can be formed in the abdomen and other areas, and a raised lump can be observed, which will move when pressed, and is painless and slow-growing. 2. Dermatofibroma: Abnormal proliferation of abdominal skin fibroblasts can lead to skin pimples and nodules, similar to sarcoma, generally hard texture, slow growth, no pain. If you have a large sarcoma in your stomach, it may be other rare tumors, such as neuroblastoma, myosarcoma, etc. You should consult a doctor in time, complete the examination, make a clear diagnosis, and then follow the doctor’s instruction to be treated accordingly.