Rheumatoid arthritis has many causes, mainly related to environmental factors and decreased resistance. Rheumatoid arthritis is a common acute or chronic connective tissue inflammation. Rheumatoid arthritis is one of the main manifestations of rheumatic fever, which is characterized by joint and muscle pain, redness, swelling and pain. 1. Environmental factors: such as prolonged exposure to cold, damp and polluted environments, as well as high population density and poor sanitation, may lead to streptococcal infections and trigger rheumatoid arthritis. 2. Decreased resistance: some patients may have decreased resistance, leading to streptococcus and other pathogens to invade the organism, thus appearing rheumatoid arthritis. Rheumatoid arthritis patients are advised to seek medical treatment in time and follow the doctor’s instructions for standardized treatment.