<s>[INST] my son has been having bad joint pain in his hands. he is 31. he feels cold all the time for the past few weeks. last night his hands & feet were sweating so badly he had to change the sheets. he had chills & weakness really bad too. upset stomach followed. can you give us a clue as to what is going on. [/INST] Hi, It looks like infection to the body. There is a need to undergo a blood and urine routine to look out for infection. Meeting up a physician post the blood and urine routine will be helpful for necessary medication. Hope I have answered your query. Let me know if I can assist you further. Regards, Jay Indravadan Patel, Physical Therapist or Physiotherapist </s>