Rheumatoid arthritis is a chronic autoimmune disease characterized by inflammation of the synovial joints, resulting in joint deformity and immobilization. It has a symmetrical and bilateral effect on joints. Symptoms include morning stiffness lasting over 30 minutes, simultaneous and symmetrical joint swelling not relieved by rest, fever, weight loss, fatigue, and enlarged lymph nodes. Diagnosis involves blood tests to check inflammatory markers and antibodies, along with x-rays, CT/MRI scans, and joint fluid analysis. Treatment focuses on relieving pain and inflammation through NSAIDs, corticosteroids, DMARDs, and biologics to prevent further joint damage.