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1. 関節リウマチ, ばね指 (腱鞘炎), 変形性手関節症, 外傷, 感染, 疲労.

It is important to differentiate the cause for joint pain by inflammatory conditions and non-inflammatory conditions.

Inflammatory

(1) Rheumatoid arthritis: Symmetric joint swelling with associated warmth, tenderness, stiffness, and pain. Although any joints may be affected, the proximal interphalangeal and metacarpophalangeal joints of the fingers are most often involved. After months or years of deformity, the most common deformities are ulnar deviation of the fingers, "swan-neck" deformity (hyperextension of the distal interphalangeal joint with flexion of the proximal interphalangeal joint), and valgus deformity of the knee. Systemic symptoms of weight loss, malaise, and fever are often present as well as complaints of morning stiffness.

(2) Infectious arthritis: Symptoms of hot, swollen joints and fever often with a sudden onset.

(3) Sj