What are the symptoms of internal rheumatism?

Rheumatoid arthritis is characterized by joint pain, mainly in the wrists, ankles, ankles, knees or neck. It is also accompanied by stiffness and swelling. It may also affect areas other than joints, such as the eyes, lungs, heart, nerves or blood vessels. If organs other than joints are involved, patients will show corresponding clinical manifestations, such as decreased vision, eye pain, and difficulty breathing. The main cause of rheumatoid arthritis is still unclear at this stage, and may be related to genetics, decreased immunity, bacteria, and viral infections. In addition, middle-aged women and smokers are also at high risk.