blujean,
thanks for the post.
The pain I would imagine is unrelated. Im at a loss for the cause as 'pain' is a general term and there a lot of options. Important factors would be the quality of the pain, the specific joint location, if the pain is worse in the morning or if progresses over the day, if he has other conditions such as thyroid illness or diabetes. He should see an internist who should give you a specific answer and thereputic course.
good luck