The following are possible causes of leg pain: 1. there may be peripheral nerve lesions, such as severe lumbar disc herniation or sciatica, which may produce vague soreness in one lower extremity and significant weakness and numbness. 2. there may be peripheral vascular lesions, such as deep vein thrombosis, which may produce vague soreness in one lower extremity and significant swelling of the entire lower extremity. 3. 3. The above-mentioned condition may also be caused by osteoporosis. Patients with osteoporosis often have bony pain in the lower limbs and weakness without any precipitating factors. Finally, the above-mentioned condition may also be caused by occupational diseases of the lower extremity bones, such as bone tumors. In clinical practice, osteochondroma is the most common type of disease for this condition.