The most common causes of lower limb soreness are over-exercise, lumbar disc herniation, muscle strain and so on. 1. Excessive exercise: If the patient is engaged in strenuous sports, it is easy to cause lactic acid accumulation in the muscles of the lower limbs, and the metabolism of lactic acid may cause lower limb soreness, which is usually relieved after sufficient rest. 2. Lumbar disc herniation: the herniated lumbar disc compresses the nerve root, which can easily cause lower limb pain and numbness, usually accompanied by lumbar pain. 3. Muscle strain: If the patient does not warm up before exercise or improper posture, it is easy to cause leg muscle strain, usually accompanied by local redness and swelling, acute injury should be iced. Lower extremity pain is caused by a variety of reasons, but also may be related to fractures, sciatic nerve compression, pyriformis syndrome and other reasons, if the symptoms do not improve after rest, it is recommended to go to the hospital in a timely manner to identify the cause of the disease, targeted treatment.