The most common causes of frequent symmetrical pain in the legs are chronic strain injury, lumbar disc herniation, sciatica, osteoarthritis, etc. If the symptoms persist, it is recommended to consult a doctor in time for treatment. 1. Chronic strain injury: If the patient is engaged in heavy physical labor for a long time, such as carrying heavy loads for a long time, it is easy to cause chronic strain injury of the leg muscles, often overworked or cold stimulation, it is easy to cause symmetrical pain in the legs. 2. Lumbar disc herniation: the human lumbar spine will increase with age or trauma and other factors such as degenerative changes, the protruding lumbar disc compression to the nerve, it is easy to cause symmetrical pain and numbness in the lower limbs. 3. Sciatica: If the sciatic nerve is compressed due to a herniated lumbar disc or a bone spur, pain and numbness in the lower back and legs will easily occur. 4. Osteoarthritis: This is a chronic disease in which the cartilage of the hip or knee joints undergoes degenerative changes due to various factors, as well as secondary osteophytes, which can easily cause symmetrical pain in the legs. The causes of symmetrical pain in the leg are many, and may also be related to fractures, osteoporosis, muscle strain, etc. If there is no relief after resting, it is recommended to go to the hospital in time to find out the cause of the disease and carry out targeted treatment.