The performance of malignant tumors on the thighs mainly include lumps, pain and redness, etc. Some patients can also be accompanied by coughing, wasting metastasis or advanced symptoms. 1. lumps, thigh malignant tumors on the more typical symptoms is the lumps, just the size will be different, usually early small, later with the continuous aggravation of the disease, the lumps will continue to increase. 2. Pain, after the volume of the tumor reaches a certain level, it will squeeze the surrounding tissues and destroy the nervous system, which will lead to the appearance of pain. 3. Redness and swelling, if the tumor is infected, the thigh area will be red and swollen, which may be accompanied by fever. 4. If the tumor invades or presses the blood vessels, it may cause necrosis and edema of the lower limbs, and may cause severe pain, thus affecting the movement; if the tumor invades the bone in some patients, it may cause mobility difficulties and pathological fracture. In addition, some patients may have generalized emaciation, cough, etc. It mainly depends on the stage, condition and metastasis. If there is any abnormality or suspicion of lower limb tumor, it is recommended to go to regular hospitals for comprehensive assessment of the condition, diagnose the disease through various means, and follow the doctor’s instructions to cooperate with the treatment, so as to avoid delaying the condition.