Leg pain is generally a normal physiological phenomenon, but may also be a sign of certain diseases such as lumbar disc herniation, spinal cervical spondylosis, and so on. 1. Physiological phenomenon: if the patient stands for a long time, it may cause the symptoms of leg pain, which is a normal physiological phenomenon and generally does not require special treatment, and the symptoms can be relieved after appropriate rest. 2. Lumbar disc herniation: Lumbar disc herniation is generally caused by injury, disc degeneration, heredity and other factors, most of the patients first appeared to recurring lumbar pain, and then leg pain, the patient will also appear sciatica, the pain can be along the back of the thighs to the calves and the back of the feet to radiate, and some patients will also appear in the lower limbs, numbness, decreased muscle strength and other symptoms. 3. Spine-type cervical spondylosis: spine-type cervical spondylosis is mostly caused by cervical spine injury, ligament hypertrophy, etc. Early stage of the patient is generally manifested as heavy or numbness of one or both lower limbs, and with the development of the disease, the patient will have the symptom of difficulty in walking, and when the disease is serious, the patient will also have pain and weakness in the limbs. If the situation of double leg pain, you can first observe for a period of time, if also accompanied by other symptoms, you should promptly go to the hospital for medical treatment, clear diagnosis, targeted.