The hip causes leg pain caused by the following causes: 1, caused by the pear muscle syndrome, because the sciatic nerve crosses the pear muscle area, when the pear muscle related diseases, such as edema, injury, scarring, etc., which causes the pear muscle on the sciatic nerve compression symptoms lead to leg pain. The main manifestation is pain in the back of the thigh and the back of the calf, pressing on the hip will lead to increased symptoms, and straightening and raising the leg in bed will also cause increased pain. 2, lumbar disc herniation, lumbar disc herniation will compress the sciatic nerve, leading to hip and leg radiating pain. The symptoms are aggravated by bending and exertion, and can be alleviated by bed rest.3. Trauma to the hip, such as muscle trauma and fracture, can stimulate the sciatic nerve and lead to sciatica with current symptoms.4. Sacroiliac joint disease can lead to hip pain and inner thigh pain, and the symptoms are aggravated by activity. Given that there are more causes, tests are needed to confirm the diagnosis such as X-rays, MRI, etc.