Rheumatoid arthritis (RA) is diagnosed through a combination of clinical assessment, blood tests for inflammatory markers (such as C-reactive protein and erythrocyte sedimentation rate), and autoantibodies (like rheumatoid factor and anti-CCP antibodies), as well as imaging tests such as X-rays or ultrasound. Management of RA includes a combination of medications like disease-modifying antirheumatic drugs (DMARDs), nonsteroidal anti-inflammatory drugs (NSAIDs), and biologics to control inflammation and slow disease progression. Physical therapy, exercise, and lifestyle modifications are also important for maintaining joint function and quality of life.