I have no idea but was diagnosed with IC some years ago. I had a history of bladder problems, retention and difficulty going, and the urologist at the time recommended a bladder suspension, which is usually done for incontinence. 2 of my doctors told me not to have it but when I needed a hysterectomy, I had the suspension done vaginaly and glad I did! That was over 20 years ago after we moved, was having some issues and had to find a new urologist. He did biopsies and diagnosed IC. Actually, he did DMSO bladder infusions and I have had no more problems.
You stink like garlic for a day or so.
About 4 years ago, began having problems with dry mouth and throat and globus. Blood work and 2 biopsies negative for Sjorgens. It gets progressively worse and now I have problems with thick phlegm they can't figure out either.
I have had burning pain on one side of my back, kind of like Shingles, no rash. They can't figure that out either. Fibro was mentioned but I know that isn't it. I assisted judges in disability hearings for a number of years and my symptoms do not meet the criteria.
Actually, what helps my back is acupuncture. He said it was a nerve probably coming from the spine.
I wish I knew of a connection. I wish I could find a doctor that would stop to think about what isn't obvious
IC and fibromyalgia go hand in hand. Sjorgren's is quite common when you have IC too. I know that if you have one autoimmune disease you are more likely to have another but I'm not sure why IC seems to be connected with so many!