It is. A friend of mine has this. It took her so much time to actually seek help, despite the excruciating pain, and she got part of her digestive system removed because it spread too much.

Nowadays, after 2 years of the surgery, she manages it with a restrict and healthy diet, and the pill. It takes a big toll on the well being even after the pain is gone, and she is almost always tired because of it, the body is constantly fighting the inflammation.