The causes of leg pain are complex, including trauma, rheumatic diseases, orthopedic diseases, etc. You can go to the emergency department, rheumatology or orthopedics for treatment accordingly. 1. Emergency Department: Trauma is one of the most important causes of leg pain, including car accidents, sports injuries, etc., which can be treated in the Emergency Department. 2. Rheumatology: leg pain may also be related to rheumatic diseases, such as rheumatoid arthritis, rheumatoid arthritis, etc., which may cause joint swelling and pain, limitation of movement and other symptoms, and at this time, you can go to the Department of Rheumatology for diagnosis and treatment. 3. Orthopedics: leg pain is one of the common diseases in orthopedics, which may be related to tibiofibular fracture, Achilles tendonitis or osteoarthritis, etc. At this time, you can go to orthopedics for diagnosis and treatment, and find out the cause of the disease and treat it as soon as possible. When the symptoms of leg pain appear, you should go to the relevant departments for consultation in time.