Soft tissue tumors, or sarcomas, may not lead to symptoms in their early stages, but as they grow, patients may experience lumps, swelling or experience pain if their tumors put pressure on muscles or nerves, notes Mayo Clinic. People should see their doctors if they persistently experience these symptoms.
People who have inherited genetic conditions such as Werner syndrome or neurofibromatosis are at higher risk of developing soft tissue sarcomas, states Mayo Clinic. Exposure to chemicals such as herbicides and arsenic and previous radiation treatments can also increase the risk of sarcomas. There are several types of soft tissue tumors, depending on the types of cells patients have that contain genetic mutations.