Rheumatoid arthritis, an autoimmune inflammatory disease primarily characterized by synovitis, is one of the most common forms of arthritis that leads patients to seek rheumatologists. This e-book is specifically crafted for medical students, junior doctors preparing for exams, and physicians keen on enhancing their knowledge of rheumatoid arthritis, aiming to provide a better understanding of the condition. We hope this e-book sheds light on this important subject.