Lateral thigh muscle pain may be caused by trauma, lumbar disc herniation, lateral femoral cutaneous nerve injury and so on. 1. Trauma: strenuous exercise or overwork, the leg is subjected to external force resulting in muscle injury, causing local pain, swelling, bruising and other symptoms. Usually there are obvious injuries. 2. Lumbar disc herniation: this is the most common cause of muscle soreness in the outer thigh. The herniation will press on the nerves causing numbness or radiating pain in the leg. 3. Lateral femoral cutaneous nerve injury: when suffering from lateral femoral cutaneous neuritis or nerve entrapment, it will show signs of pain sensitization or hyperalgesia in the innervated area, and may show symptoms of muscle aches and pains. In addition to the above factors, there may be other reasons, it is recommended to go to the hospital as soon as possible for examination, the doctor to clarify the cause of the disease, and then give targeted treatment.