Possible causes of discomfort in the left leg root and hip joint are: femoral head necrosis, ankylosing spondylitis, hip osteoarthritis, etc. The treatment can be broadly categorized into conservative and surgical treatments. 1. Necrosis of femoral head: In the early stage of necrosis of femoral head, the non-weight-bearing surface is necrotic and the necrotic foci are small, conservative treatment can be taken, including reducing weight-bearing, physical therapy, use of some drugs to slow down the progress of the disease. Commonly used drugs are celecoxib, warfarin, bisphosphonates and so on. If conservative treatment is ineffective and the bone necrosis is aggravating, surgical treatment should be considered, including core decompression, osteotomy, hip replacement and so on. 2. Ankylosing spondylitis: At the initial stage of ankylosing spondylitis, the main manifestation is lumbosacral discomfort or hidden pain, and when it involves the hip joint, there will be pain around the hip joint. Conservative treatment can be taken at the initial stage, including the use of non-steroidal anti-inflammatory drugs such as celecoxib and keeping the waist upright. Arthroplasty can be performed for obvious hip ankylosis, and lumbar spine orthopedic surgery can be performed for obvious hunchback deformity. 3. Osteoarthritis of the hip: Conservative treatment can also be adopted in the early stage of osteoarthritis of the hip, including reducing weight bearing, avoiding strenuous activities, and using non-steroidal anti-inflammatory drugs, such as celecoxib, etc. The joint cavity can be injected with sodium hyaluronate. Sodium hyaluronate injections into the joint cavity can protect the articular cartilage and slow down the progression of the disease. Surgery should be considered when significant pain or joint deformity occurs. Depending on the condition, arthroscopic surgery, osteotomy, arthroplasty, etc. can be chosen. We suggest that patients with discomfort in the left leg root and crotch joint should go to the hospital as soon as possible to find out the cause of the discomfort and treat it accordingly. The above drugs should be used under the guidance of a doctor, avoid self-medication.