The term "cystitis" literally means irritation of the urinary bladder. Although this term is rather general, there is a common form of cystitis that occurs in male and female cats.

There are several principal factors that may predispose your cat to this disease. These may include confinement, obesity, pet care practices which reduce the frequency of urination, diet and lack of proper water intake.

FUS, or Feline Urological Syndrome refers to problems associated with the cat's bladder and urethra in particular.