I second what Gail/Nanners wrote. You need an evaluation by a rheumatologist for the joint issues. What you describe sounds like enteric arthritis that is associated with Crohn's. After taking Lialda for a year, I doubt the joint issues would be a side effect.
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CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.