Broadly defined, IC is having discomfort and needing to go to the bathroom for more than 6 weeks, without having an infection. The infection part is really important because this is what sets it apart from other conditions like a UTI which causes pain and need to use the bathroom but is caused from a bacteria and can be treated with medication. IC has no infection and can't be treated with drugs. There is 2 types of IC. Those with ulcers and those without. Those with ulcers have tears in the lining of the bladder which causes pinpoint bleeding and extra pain because the urine irritates behind the bladder wall. Luckily, this only happens to 10% of people (like me!). Those without ulcers show no physical malformation with their bladder.