Urinary problems in cats are often part of a wider complex of symptoms that vets call feline lower urinary tract disease (FLUTD). FLUTD can affect the bladder and/or urethra. Cystitis means inflammation of the bladder. It is common for pet owners to assume that cystitis is due to a urinary tract infection (UT). While UTIs can occur, cystitis is more commonly due to other underlying health conditions, such as bladder crystals or stones, as well as tumours, diabetes or stress.
Another urinary system problem, which is particularly common in older cats, is kidney disease (or kidney failure). This means their kidneys gradually stop filtering out toxins and reabsorbing water. Although irreversible, the correct diet and treatment can help slow the condition.