Rheumatoid arthritis is a chronic autoimmune disorder in which the immune system mistakenly attacks the joints, leading to inflammation, pain, swelling, stiffness, and reduced joint mobility. It commonly affects smaller joints such as those in the hands and feet and may progress to involve other organs if left untreated. The condition can cause fatigue and long-term joint damage, impacting daily activities and quality of life. Early diagnosis and appropriate medical management help control inflammation, relieve symptoms, slow disease progression, and maintain joint function.