Soft tissue sarcomas are rare but serious cancers that can sneak up on anyone. They grow in the body's soft tissues, like muscles, fat, and nerves. In its early stages, soft tissue sarcoma frequently exhibits no symptoms. Nonetheless, a few potential symptoms are as follows: Swelling or lump: a gradual growth of a soft, painless lump that is difficult to move. It won't hurt or bruise, even though it could appear to be an injury bump. As the tumour develops and pushes against muscles or nerves, pain may become apparent.