What Causes Pain In Joints?

MY WIFE(35) IS HAVING PAIN IN NECK TO SOULDERS, ELBOW KNEE AND ALL OTHER JOINTS AND HAVE CONSULT THE ORTHOPEDIST AND PHYSICIAN AND DONE ALL THE TEST LIKE RFT, URIC ACID AND BSR ETC. ALL THE REPORTS ARE NEGATIVE. SHE IS TAKING MEDICINE OF DEFICIENCY OF VITAMIN 'C' FOR LAST WEEK BUT NO RELEAF, WHAT SHOULD I DO SHOULD I REFER TO NEURO PHYSICIAN