Arthritis (from Greek arthro-, joint +  -itis, inflammation, plural: arthritides) is a group of conditions where there is a damage caused to the joints of the body.
Arthritis is the leading cause of disability in people over the age of 55.

There are many different forms of arthritis, ostheoarthritis (also known as degenerative joint disease) occurs following trauma to the joint, following an infection of the joint or simply as a result of aging.
Furthermore, there is emerging evidence that abnormal anatomy may contribute to early development of osteoarthritis.

Other forms of arthritis are rheumatoid arthritis and psoriatic arthritis, which are autoimmune diseases in which the body is attacking itself.

Septic arthritis is caused by joint infection.

Gouty arthritis is caused by deposition of uric acid crystals in the joint that results in subsequent inflammation. Additionally, there is a less common form of gout that is caused by the formation of rhomboidal shaped crystals of calcium pyrophosphate. This form of gout is known a pseudogout.

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