Diagnosing rheumatoid arthritis (RA) can be challenging because its symptoms resemble those of many other diseases. The condition often only shows clinical signs like joint swelling and deformity when it becomes severe. Therefore, understanding the symptoms and diagnostic methods is essential for patients to seek medical help promptly when symptoms appear. This article is written under the professional guidance of doctors from the Department of Orthopedics and Sports Medicine at Vinmec International General Hospital.