I was wondering is fibromyalgia, endometriosis, interstitial cystitis and acid reflux considered autoimmune disease?

No, no, no, and no . Autoimmune diseases are diseases in which the immune system attacks the body itself causing inflammatory pain. Functional pain such as fibromyalgia is the perception of pain in normal structures (muscles, ligaments, tendons). Other causes of pain are abnormal tissue (endometriosis) or direct effect of acid (reflux) burning sensitive tissue. Interstitial cystitis is inflammation (not autoimmune).

Related Questions

Lower left abdomen/back pain, I have interstitial cystitis, endometriosis, ibs, and pfd. The pain is unbearable, can any of these be the cause? Help: (

Any Could be. All of them can cause symptoms. It is sometimes difficult to figure out which is causing symptoms at any given time. A pelvic ultrasound is the place to start since certain problems can actually be visualized. Then deciphering some of the specific other symptoms or lack of symptoms can help figure out what is happening. Read more...
Back Pain. Could be unrelated. As with most pain conditions, there can be a variety of potential problems that can cause the pain that you are describing. It is difficult to diagnose with the short description given and without a proper physical examination. Pain is often a sign of inflammation. A qualified pain specialist should be able to help. Read more...

How common do interstitial cystitis and endometriosis occur together?

Very Common. They commonly co-exist. In addition, sometimes one is confused for another and so diagnostic procedures (cystocopy or laparoscopy) are very important to distinguish between the 2 conditions. Read more...
60-70% It is very common, so common that the bladder should be evaluated at the time of laparoscopy for endometriosis. Read more...

Does hypothyroidism and interstitial cystitis have any connection? Are they caused by an autoimmune disorder?

No connection. Hypothyroidism is often autoimmune but interstitial cystitis remains mysterious. Both are very common and I think if you have them both, it's best attributed to dumb luck. I hope you find a way of managing the interstitial cystitis. Read more...