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A type of inflammatory arthritis characterized by recurrent attacks of a red, tender, hot, and swollen joint, caused by elevated levels of uric acid in the blood.

A vascular disorder causing discoloration of the fingers, toes, and occasionally other areas, due to an excessive response to cold or stress.

Refers to diseases where the characteristic autoantibodies are absent, often seen in certain types of arthritis.

A group of inflammatory diseases that involve both the joints and the entheses (sites where the ligaments and tendons attach to bones).

A rare autoimmune disorder with overlapping features of lupus, scleroderma, and polymyositis, and uniquely characterized by high levels of anti-U1 RNP antibodies.

Inflammation of the uvea, the middle layer of the eye that consists of the iris, ciliary body, and choroid.

Rheumatoid Factor

Human Leukocyte Antigen B27

Disease-Modifying Antirheumatic Drugs

Inflammation of the muscles, which can cause muscle weakness and pain.

A rare disorder causing inflammation in blood vessels throughout the body.

C-Reactive Protein

Inflammation of the entheses, the sites where tendons or ligaments insert into the bone.

Inflammation of the cartilage.

Inflammation of the blood vessels that can cause vessel walls to thicken, narrow, weaken, or scar, affecting flow of blood throughout the body.

An abnormal layer of fibrovascular tissue or granulation tissue, common in rheumatoid arthritis, that spreads over joint surfaces and causes cartilage erosion.

Calcium Pyrophosphate Deposition Disease

An autoimmune condition that develops in response to an infection in another part of the body (cross-reactivity).

Inflammation of the synovial membrane, the lining of the joint.

A group of rare, progressive diseases that involve the hardening and tightening of the skin and connective tissues.

Bony enlargements on the middle joints of fingers, often associated with osteoarthritis.

Osteoarthritis

Antinuclear Antibody

A condition characterized by widespread musculoskeletal pain accompanied by fatigue, sleep, memory, and mood issues.

Anti-Cyclic Citrullinated Peptide antibody

Bony enlargements of the small joints at the distal end of the fingers commonly associated with osteoarthritis.

Inflammation of the fingers or toes which may present as swelling giving a sausage-like appearance, often seen in psoriatic arthritis and other spondyloarthropathies.

Psoriatic Arthritis

An autoimmune disorder characterized by blood clots and pregnancy complications, associated with antiphospholipid antibodies.

A disease involving inflammation of small blood vessels, causing them to bleed into the skin, joints, intestines, and kidneys.

Rheumatoid Arthritis

Systemic Lupus Erythematosus

The infection of a joint, usually caused by bacteria, which can lead to rapid joint destruction.

A rare form of vasculitis that affects large and medium-sized arteries, particularly the aorta and its main branches.

Tumor Necrosis Factor

An inflammatory disorder causing muscle pain and stiffness, most commonly in the shoulders and hips, often associated with giant cell arteritis.

An inflammation of the kidneys caused by systemic lupus erythematosus.

A rare multisystem disorder characterized by recurrent inflammation of cartilage and other tissues throughout the body.

A chronic autoimmune disease characterized by dry eyes and dry mouth.

A rare condition involving lung nodules in individuals with rheumatoid arthritis who have had significant exposure to coal dust.

A fluid-filled cyst that causes a bulge and a feeling of tightness behind the knee.

Inflammation of the cartilage that connects a rib to the sternum (breastbone).

A rare inflammatory disorder characterized by high fevers, rash, and joint pain that may progress to chronic arthritis.

Ankylosing Spondylitis

Deposits of monosodium urate crystals in people with longstanding hyperuricemia (which results in gout).

Erythrocyte Sedimentation Rate