A UTI is an unbearable infection, caused by bacteria traveling into your urinary system. UTIs cause you to have the feeling of constantly having to urinate. It is just a trick though, because, when you try to relieve yourself, you actually cannot go at all; and when you do finally go, you are attacked by a severe painfully burning sensation. Not to mention, when you are not urinating (or attempting to) you are forced to endure the most painful of cramps and fatigue. If you, yourself, have ever suffered through a UTI, then you know exactly what I mean when I say that it is a horrible and merciless infection.