Actually - I've been through this myself. Around my 3rd-4th dose of Remi, I started having severe pain and stiffness in hips, back and knees.
I was also negative for Remicade antibodies, lupus, etc. but have a positive ANA.
This result generally means that autoimmune disease is present (that the immune system is attacking connective tissue). A positive ANA can be caused by UC itself, autoimmune hepatitis, scleroderma, rheumatoid arthritis, etc.
In fact, healthy people - between 3-15% - also test positive for ANA.
With respect to Connor's advice (and believe me, I thought the same thing when I first had these issues), I would have a long talk with your doctor to get to the cause of the ANA before you jump to stopping the Remicade. It took a solid 6 infusions and a frequency adjustment to get me a better response to the Remi.
Also, the joint pains are VERY common with Remicade - join the Remicade group on Facebook and you'll see what I mean. Mine cropped up and stuck around for about
a month to six weeks, and then were gone after the next infusion.
Some people also note that they have those pains in the beginning of Remi treatment after tapering steroids, so if you have been on prednisone or hydrocortisone recently, you might want to consider that also.
Whatever you do, please have a thoughtful consultation with your doc before stopping treatment
