A painful infection in your bladder where you feel like you have to pee all the time and when you do go to pee barely anything comes out. Its a highly uncomfortable feeling and annoying as hell. Once you get one, its easier to get a relapse. Doctos give you antibiotics to get the infection out of your system. If you don't take care of the probem right away, you start having pains in your back which demonstrates the start of a kidney infection.
I would know, I've had it several times. I sure hope it doesn't come back!