Synovitis and rheumatoid arthritis are two different joint diseases. Synovitis and rheumatoid arthritis are different in terms of causative factors, clinical symptoms and treatment modalities. 1. Causes: Synovitis is caused by acute trauma and chronic strain, or joint degeneration, osteophytes, etc. Rheumatoid arthritis is caused by hemolytic streptococcus. Rheumatoid arthritis is caused by hemolytic streptococcal infection or humid environment and genetic factors. 2. Clinical symptoms: synovitis is the synovial membrane is stimulated, triggered by the synovial membrane inside the joint congestion and edema, as well as the production of aseptic inflammation, resulting in joints soreness and pain. When synovitis is severe, it can lead to fluid accumulation in the joint cavity, causing swelling and limitation of joint movement. Rheumatoid arthritis is caused by hemolytic streptococcal infection or prolonged exposure to cold and damp environments, resulting in widespread pain in the large joints of the body, accompanied by muscle aches and pains. 3. Treatment: Patients with synovitis can be treated with oral diclofenac sodium, celecoxib and other non-steroidal anti-inflammatory drugs for anti-inflammatory pain relief, as well as glucocorticosteroids such as tretinoin injected into the joint cavity. Or take arthroscopic synovectomy, subarticular radiofrequency ablation for treatment. Patients with rheumatoid arthritis can be treated with penicillin and other antibiotics to fight infection. It is recommended that patients with synovitis and rheumatoid arthritis go to the hospital in time to complete the relevant examinations to clarify the cause of the disease and standardize the diagnosis and treatment under the guidance of the doctor.