Rheumatoid factor over 20IU/ml is usually more serious, and its severity needs to be judged in conjunction with clinical symptoms and other relevant examinations. The normal value of rheumatoid factor is 0 to 20IU/ml, and exceeding this value is common in rheumatoid arthritis, systemic lupus erythematosus, dry syndrome and other diseases. Rheumatoid factor is used as an auxiliary test in the clinic, and doctors can use the value of rheumatoid factor to make certain auxiliary diagnosis of the patient’s disease. Elevated rheumatoid factor is common in rheumatoid arthritis, systemic lupus erythematosus, dry syndrome and other diseases. Most of the patients with these diseases have a rheumatoid factor higher than 20IU/ml, but in addition to the sign of elevated rheumatoid factor, there are other abnormalities in the examination and clinical symptoms, which need to be combined with the clinical manifestations and further examination to confirm the diagnosis of the disease. Patients with elevated rheumatoid factor should pay attention to keep warm in daily life and avoid getting cold, so as not to aggravate the disease. It is recommended that patients with elevated rheumatoid factor go to the hospital in time for treatment under the guidance of the doctor.