There are many causes of thigh muscle pain, which need to be combined with specific performance to analyze the following: 1. If there is a history of long-distance walking or strenuous exercise, it may be a local muscle strain or lactic acid accumulation. 2. If there is local redness and swelling, it may be cellulitis. 3. If there is a significant local mass, it may be a muscle tumor lesion, such as rhabdomyosarcoma. 4. If there is a history of eating lobster, it may be rhabdomyolysis syndrome. 5. If the pain is accompanied by bone, it may be a disease of bone, such as giant cell tumor of bone, bone cyst, osteochondroma, etc., which involves muscle pain. 6. If there is a history of trauma, it is considered that the pain is caused by muscle contusion, etc. The local appearance has obvious abnormalities, to timely MRI examination of the thigh, if only muscle lactic acid accumulation pain, you can use local massage, more rest and other treatment to facilitate relief.