Arthritis is an inflammation of one or more joints. Joint pain and stiffness are the main symptoms of arthritis. There are different types of arthritis which can affect specific areas.
Osteoarthritis is a degenerative joint disease where cartilage in the joints wears down over time, leaving bone rubbing on bone. It can affect any joint in the body, but most commonly affects the hands, hips, knees, neck, and lower back.
A condition triggered by an infection that occurs in another part of the body, most often the intestines, genitals, or urinary tract. Defining features of reactive arthritis include painful and swollen knees, ankles, or feet, as well as inflammation in the eyes, skin, or urethra.
A chronic inflammatory disorder that occurs when the immune system attacks the synovium, the lining of membranes surrounding the joints. Most often affects the small joints in the hands and feet, causing a painful swelling that can result in bone erosion and joint deformity.