In this section, you'll learn about Feline Lower Urinary Tract Disease, or FLUTD, for short. This term describes different problems that can affect a cat's bladder and the urethra, the tube that carries urine out of the body. FLUTD is common in cats that are middle-aged, overweight or don't get much exercise. Cats that stay indoors all the time and have changes in their routines, like moving to a new house or living with other cats, can also be more likely to get FLUTD.