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Rheumatoid arthritis is a systemic autoimmune disease. It is not caused by old age, years of hard work, or injury. In fact, the true cause of rheumatoid arthritis remains unknown. In this disease, a person's immune system attacks the synovial membranes that cover the joints, causing pain, swelling, heat, and eventual deterioration of the joints.
This disease can onset at any age. When it occurs in children, it is called juvenile rheumatoid arthritis. This form is rarer than adult onset rheumatoid arthritis. When the disease occurs in adults, it occurs more often in women than in men. Rheumatoid arthritis is a chronic disease that progresses over a person's lifetime. Currently there is no cure. Although the cause is unknown, the disease is known to have a strong hereditary component. Prior infections are also suspected to play a roll in the development of this disease.

Symptoms of this disease include pain, swelling, and stiffness in multiple joints. Usually the smaller joints of the body are affected, including the finger and wrist joints, the foot and ankle joints, and the joints in the cervical spine (the neck). Larger joints can also be affected, especially as the disease progresses. Joints on both sides of the body are usually affected, and multiple joints are affected, not just one or two.
When joint swelling occurs in rheumatoid arthritis, the joints become enlarged and warm to the touch. They may appear red in color. Stiffness is present in the affected joints, especially in the morning. A person may feel stiffness in the joints for an hour or more after getting out of bed in the morning. This makes movement difficult until the stiffness wears off. Other common symptoms a person may experience include fatigue, dry eyes, and skin lesions.
As rheumatoid arthritis progresses, joint deformities may occur. The knuckles of the fingers may deteriorate, causing the tendons of the finger muscles to pull the fingers toward the little finger side of the hands. This deformity is called ulnar drift. Another deformity that can occur is Boutonniere deformity, in which the small joints of the finger deform in a way to appear that the finger is permanently pushing down on a flat surface. The middle joint is flexed and the far joint is extended. A third deformity that can occur is swan neck deformity, where the joints deform in a way that causes the finger to take the shape of a swan's neck. The middle joint is extended and the far joint is flexed.
Rheumatoid arthritis

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