Initially, people with interstitial cystitis may have no symptoms. Symptoms usually appear gradually and worsen over years as the bladder wall is damaged. People have pain or pressure over the bladder or in the pelvis or lower abdomen. People also feel the need to urinate frequently and urgently, often many times per hour. Symptoms worsen as the bladder fills and diminish when people urinate. In very severe cases, people may sit on the toilet for hours, letting urine dribble out continuously.