1.Lumps Patients often consult the doctor with painless lumps, which may last for several days or more than one year, and the lumps gradually increase in size, especially the tumors in the limbs. Tumors in deeper parts are often difficult to be found, such as those located in the thoracic cavity and retroperitoneum. Soft tissue tumors vary in size, depending on the site of growth and the rate of growth. Tumors that grow faster and are located in deeper tissues tend to have unclear borders. On the contrary, if the tumor grows slowly and is located on the body surface, the border is mostly clear. Pain Soft tissue tumors are mostly painless lumps, such as sarcoma growing faster, often accompanied by dull pain. If the tumor involves adjacent nerves, pain is the first symptom. In some cases, because of the deeper part of the tumor, the pain is often felt first, and then the lump appears. When the sarcoma bleeds, it can be acute onset of pain. Occult pain often shows extensive necrosis of the tumor, or pressure chasing the somatosensory nerves. Pain in malignant neurogenic tumors occurs in the area of the nerves through which it branches. If the sarcoma is painful, the prognosis is often poor. The hardness of soft tissue sarcoma depends on the source of tissue and blood supply. If there are more fibers and smooth muscles in the tumor, the texture will be harder; while if there are more blood vessels, lymphatic vessels and adipose tissue, the texture will be softer. Although these tumors can spread to all parts of the body, some tumors have their preferred sites. Fibrous tumors mostly occur in skin and subcutaneous tissue. Fatty tumors mostly occur in arm, lower limb and retroperitoneum. Mesothelioma occurs in the thorax, abdomen and pericardium. Smooth muscle-derived tumors tend to occur in the abdominal cavity and trunk. Rhabdomyosarcoma-derived tumors occur mostly in the muscular layer of the limbs. However, embryonal rhabdomyosarcomas are commonly found in the skull, orbits, nasal cavity and external genitalia. Synovial sarcoma is prone to occur near joints and at fascia. The activity of soft tissue tumors is related to their sites of occurrence, pathological types and duration of disease. Benign and low malignant tumors often have superficial growth sites and greater mobility. Tumors with deep growth site or infiltration of surrounding tissues have smaller mobility. Tumors located in the muscle layer are active when the muscle is relaxed, more fixed when the muscle is contracted, and fixed when the tumor involves the periosteum or invades the bone. Retroperitoneal tumors are mostly fixed due to anatomical relationship. 6.Temperature The blood supply of soft tissue sarcoma is rich, and the metabolism is vigorous, and the local temperature can be higher than that of the surrounding normal tissues, but the local temperature of benign tumors and low malignant sarcoma is often normal. 7.Regional lymph nodes Soft tissue sarcoma can be metastasized along lymphatic channels. Synovial sarcoma and rhabdomyosarcoma are often accompanied by regional lymph node enlargement, sometimes fused into a mass.