EFO_1000869 (chronic interstitial cystitis) is a condition with recurring discomfort or pain in the URINARY BLADDER and the surrounding pelvic region without an identifiable disease. Severity of pain in interstitial cystitis varies greatly and often is accompanied by increased urination frequency and urgency. Also known as: Cystitis, Interstitial, Interstitial cystitis, chronic interstitial cystitis (disorder), chronic interstitial cystitis (disorder) [Ambiguous], chronic interstitial cystitis NOS (disorder).