Usually rheumatoid arthritis is clinically called rheumatoid arthritis and dilated cardiomyopathy is clinically called dilated cardiomyopathy. Rheumatoid arthritis can cause dilated cardiomyopathy. Rheumatoid arthritis belongs to a kind of erosive, symmetrical polyarthritis as the main manifestation of chronic, systemic autoimmune disease, its basic pathological manifestations of synovitis, vasculitis and so on. Rheumatoid arthritis can cause heart disease, causing cardiovascular lesions due to rheumatoid inflammatory mediators leading to vascular inflammatory lesions, as well as drug factors. Rheumatoid arthritis involving the heart is mostly seen in some patients with positive rheumatoid factor and rheumatoid nodules. It can manifest as unstable angina, myocardial infarction, stable angina, dilated cardiomyopathy and so on. So rheumatoid arthritis can cause dilated cardiomyopathy. It is recommended that patients with rheumatoid arthritis go to the hospital in time to assess their condition and standardize the diagnosis and treatment under the guidance of the doctor, and have regular follow-up.