<s>[INST] 2 days ago for no apparent reason i began to experience severe joint pain and intense muscle soreness.also noticed on day 1 my legs were very red.very even redness top to bottom,not splotchy or broken. then i noticed both my arms getting red as well.also experiencing a general rundown feeling. any ideas? [/INST] these pains and redness must be assessed for an autoimmune disorder if persisted for more than 3days..get a ESR test done..  Rh.factor ..CBC </s>