HI Lara, Usually with IBD. it causes joint pain and arthritis to form, due to the nature of the disease.It all has to due with the immune system. Especially when inflammation is present. usually when inflammed you tend to get pain in you lower part of your body ankles, knee's, hips and lower back pain. This is not unusal, You can ask your doctor about some pain medication, but no NSAID's it will only make your inflammation worse NSAID's can weaken the intestinal walls. NSAID's are asprin, advil, or ASA and others.Your better off taking tyenol, acetaminophen. best wishes.