Soreness on the outer thighs is mostly considered to be caused by trauma, cold and lumbar disc herniation compressing the nerve root, which can be handled by medication and surgical treatment. 1. Trauma: If the lateral thigh pain is caused by external stimuli such as impact, you can use non-steroidal anti-inflammatory drugs to relieve the pain, such as diclofenac sodium, as prescribed by the doctor. 2. Cold: cold on the outside of the thigh may cause aseptic inflammation, which leads to the phenomenon of soreness, you can take the local hot compresses to accelerate blood circulation, relieve the soreness. 3. Lumbar disc herniation: the bulging lumbar disc may cause radiating pain in the lower limbs after compression of the nerve root, so the soreness of the outer thighs may be caused by lumbar disc herniation. In addition to the use of non-steroidal anti-inflammatory drugs such as diclofenac sodium as prescribed by the doctor for pain relief, the lumbar disc herniation treatment should also be carried out, such as minimally invasive surgery to the compression of the nerve root of the disc portion of the resection or ablation, etc. The patient should go to the hospital for a detailed examination. Patients should go to the hospital for a detailed examination to confirm the cause of the disease and then give targeted treatment.