Idiopathic Feline Lower Urinary Tract Disease (IFLUTD) is a general term for disorders characterized by blood in the urine, difficult or painful urination, abnormal, frequent passage of urine, urinating in inappropriate locations (ie., bath tub), and partial or complete blockage of the urethra. Also known as Feline Idiopathic Cystitis (FIC), Feline Urologic Syndrome (FUS), or Interstitial Cystitis, this treatable condition occurs in the bladder and urethra of the lower urinary tract; that is, the tube from the bladder to the outside, through which urine flows out of the body.
Idiopathic feline urinary tract disease, and inflammation of the bladder for unknown reasons, are diagnosed only after known causes such as kidney stones or urinary tract infection have been eliminated. Any of the above symptoms or combination of these symptoms may be associated with feline lower urinary tract disease. The same symptoms may apply to diversely different infections, and pinpointing the exact cause for the condition can be complicated, since the feline urinary tract responds to various outside influences in a limited and predictable fashion.
This disease occurs in both male and female cats. The incidence of blood in the urine, difficult or painful urination, and/or blockage of the urethra in domestic cats in the U.S. and U.K. has been reported at approximately 0.5 percent to 1 percent per year. While it can occur at any age, it is found most commonly cats between the ages of one and four-years-old. It is uncommon in cats less than one year of age and in cats greater than 10 years of age.