Gout is a form of crystalline-arthritis which can cause swelling and pain in the joints. The most common locations for gout initially include the foot (especially the base of the big toe) and ankle.

The term vasculitis refers to inflammation of the blood vessel that may result in loss of integrity of the blood vessel walls and blockages of blood flow from the thickened vessel walls to other organs.

The Spondyloarthropathies are systemic inflammatory diseases that may affect the joints and other organ systems. Conditions include: psoriatic arthritis, ankylosing spondylitis, inflammatory bowel disease related arthritis and reactive arthritis.

Systemic Lupus Erythematosus (lupus) is an autoimmune disease that may affect any organ system including the skin, joints, kidneys, heart, lungs and nervous system.

Rheumatoid Arthritis (RA) is a systemic inflammatory autoimmune disease mainly affecting the small joints in the hands/wrists and feet, but can also affect other joints as well except for the lumbo-sacral spine and the DIPs (joints closest to the nails in the hands).