Feature on a painful bladder disorder that several million people most likely live with in the U.S. but have no idea what it is because it is so difficult to diagnose.

Called interstitial cystitis or IC, this illness if often very painful and debilitating. There is no known cause or cure for the disease but as doctors are learning more about it they are better able to treat the symptoms.

Interstitial Cystitis Network Interstitial Cystitis Association