The first criteria here to diagnose someone with rheumatoid arthritis is morning stiffness that lasts longer than one hour. Furthermore, soft tissue swelling of three or more joints.
And the third criteria in this list is basically swelling of the proximal interphalangeal joints. Furthermore, swelling of the metacarpophalangeal joints, and swelling of the wrist joints.
The fourth criteria is symmetric swelling of the joints bilaterally. And these four first criteria have to be present longer than six weeks.
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