Arthritis is a joint inflammation that causes pain and stiffness in the joints and surrounding tissues. It is mainly divided into seven groups including inflammatory, degenerative, soft tissue musculoskeletal pain, back pain, connective tissue disease, infectious, and metabolic arthritis. The most common types are osteoarthritis, rheumatoid arthritis, psoriatic arthritis, fibromyalgia, gout, ankylosing spondylitis, and scoliosis. Symptoms include morning stiffness, fever, swelling, pains, numbness, weakness, and deformity. Causes can be obesity, vitamin deficiency, injury, aging, lack of exercise, immune or metabolic dysfunction, and stress. Treatment involves medications, surgery, therapies, and assistive devices.