Interstitial cystitis (in-tur-STISH-ul sis-TIE-tis) — also called painful bladder syndrome — is a chronic condition in which you experience bladder pressure, bladder pain and sometimes pelvic pain, ranging from mild discomfort to severe pain.
Your bladder is a hollow, muscular organ that stores urine. The bladder expands until it's full and then signals your brain that it's time to urinate, communicating through the pelvic nerves. This creates the urge to urinate for most people. With interstitial cystitis, these signals get mixed up — you feel the need to urinate more often and with smaller volumes of urine than most people.
Interstitial cystitis most often affects women and can have a long-lasting impact on quality of life. Although there's no treatment that reliably eliminates interstitial cystitis, medications and other therapies may offer relief.