Undifferentiated pleomorphic mucinous sarcoma is a relatively rare cancer that originates in the mesenchymal tissues, mainly the soft tissues of the body. Its symptoms are also related to the location of the disease. The cause of undifferentiated pleomorphic mucinous sarcoma is unknown. Risk factors include older age or a history of radiation therapy. Undifferentiated pleomorphic mucinous sarcoma can occur anywhere in the body, most commonly in the arms and legs. Symptoms of undifferentiated pleomorphic mucinous sarcoma are mainly related to the location of the tumor. Common symptoms include localized lumps, localized pain, tingling, and swelling in the extremities, and indigestion, abdominal pain, and constipation in the abdomen. Undifferentiated pleomorphic mucinous sarcoma has a high degree of malignancy, and the key to treatment is early diagnosis, and the current treatment methods include surgery, radiation therapy and chemotherapy. If you fit the characteristics of the high incidence group and have related symptoms, you must seek medical attention promptly.