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COMMON DISEASES > ARTHRITIS
Inflammation of one or more joints. (See also arthralgia.)
Causes, incidence, and risk factors
Joint inflammation, which
causes redness, swelling, pain and sometimes loss of motion,
is
a body's normal reaction to damage or the presence of a
foreign agent in that area. This is
seen frequently when there is an injury to a joint (including
fracture) or the presence of a
virus or bacteria. Most of the time inflammation goes away
after the injury has healed or
the virus or bacteria has been wiped out by the immune system.
With some injuries and some diseases the inflammation does not
go away and this is considered arthritis.
Altogether there are more
than 100 kinds of arthritis, and there are many different
diseases that can cause it. Gout and scleroderma are two such
diseases. Arthritis can also develop as a complication of
another disease caused by a virus, bacteria, or fungus.
Gonorrhea is one of these diseases. When this happens it is
considered infectious arthritis. Autoimmune disorders, such as
rheumatoid arthritis, are diseases in which something goes
wrong with the immune system and it attacks healthy parts of
the body.
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