Human bladder is a hollow bag like structure made of muscles to store urine. The bladder keeps expanding as urine gets filled in it and once the bladder is full, it sends a signal to the brain through pelvic nerves. The brain then signals the person that he/she needs to empty it.
Interstitial Cystitis is a chronic condition causing pressure and/or in the bladder and pain in the pelvis region some times. This pain can vary from mild to very severe. Interstitial Cystitis is one of the conditions under a broad spectrum of painful bladder syndrome. More than men, this condition affects women and only has medications to give relief to an extent.