Why do i have extreme joint pains and stiffness in hips, lower back, elbows, knees and feet? r.a. has been ruled out. my x- rays come back fine.

Multiple joint pain: Joint pain is either degenerative (osteoarthritis) or inflammatory. There are over 100 kinds of arthritis. If rheumatoid factor is negative, you would look to ESR and CRP first. There are a battery of tests that follow for rarer conditions as more common ones are ruled out. Disease Markers (RF, CCP, ANF/ANA) for example. A rheumatologist may be helpful, as well as your primary doc