Thanks for writing to us.
From your description it seems that your friend is severely affected with polyarthralgia
. It can be due to an autoimmune cause or a post viral infection. Proper blood investigations and X-rays of the affected joints will help in the diagnosis.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Praveen-Tayal
Dr. Praveen Tayal