Lower limb pain may be caused by physiological reasons such as overwork, or it may be caused by pathological reasons such as lumbar spine disease, trauma and lower limb vascular disease. 1. Overwork: common in long-term standing or walking people, patients with lower limb muscle overwork caused by the accumulation of local lactic acid, patients can appear lower limb pain. 2. Lumbar spine disease: commonly seen in lumbar intervertebral disc herniation compressing the nerve root innervating the lower limbs, causing radiating pain and numbness in the lower limbs of patients. 3. Trauma: Trauma to the lower limbs can lead to muscle, ligament and other soft tissue injuries, or even fractures, and patients may experience severe pain, swelling, and restricted movement of the lower limbs. 4. Lower extremity vascular disease: such as lower extremity venous thrombosis, arterial embolism and other diseases, patients may experience lower extremity swelling, pain, numbness, intermittent claudication and other symptoms. Lower limb pain may also have other causes, it is recommended that patients go to the hospital in time to improve the examination, to clarify the cause of the disease and then give further treatment.