Joint swelling — noticeable fullness, puffiness or fluid around a joint such as the knee, ankle, wrist or finger — can result from many different conditions. This page outlines common causes, general approaches to evaluation, and which medical specialties are usually involved. For personal diagnosis and management, see a healthcare professional; if you have severe or rapidly worsening signs, seek urgent care.
Swelling around a joint can follow direct injury (sprain, fracture, or internal bleeding), degenerative conditions like osteoarthritis, inflammatory diseases such as rheumatoid arthritis, crystal‑related arthritis (gout or pseudogout), tendon or bursa inflammation, and septic (infectious) arthritis. Systemic inflammatory or metabolic disorders may also cause joint swelling.
Joint swelling often occurs with pain, limited range of motion, redness and local warmth. Warning signs that need prompt medical attention include sudden severe pain, rapidly increasing swelling, high fever, marked redness or loss of joint function. If these occur, contact emergency services or the nearest urgent care.
Evaluation usually begins with a focused physical exam. Imaging such as X‑ray, ultrasound or MRI can assess bone, cartilage and fluid. Sampling joint fluid (arthrocentesis) may be done to check for infection, crystals or inflammatory cells. Blood tests can help detect inflammation or specific disease markers. A clinician decides which tests are appropriate.
Primary care or family medicine is often the first point of contact. Referral depends on suspected cause: Rheumatology for inflammatory or autoimmune conditions, Orthopedics for trauma or surgical concerns, Infectious Diseases and clinical microbiology for suspected septic arthritis, and Dermatology if skin findings accompany the swelling. Physical medicine and rehabilitation may assist with recovery of function.
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