cytitis and urinary tract disease in cats
This is a rather complex problem. Straightforward cystitis caused by an infection is relatively rare, particularly in neutered cats.
An inflammatory type of cystitis, which is caused by a lack of a chemical which is found in the lining of the bladder, is however relatively common. In other individuals problems develop because crystals and small mineral deposits form in the urine. These may cause irritation, giving an effect very similar to cystitis or they can form larger deposits which may be microscopic 'stones' or larger stones which would be visible on an x-ray or an ultrasound scan.
These stones can then cause the bladder to become blocked and the cat cannot pass urine or may dribble small amounts of urine which may sometimes appear similar to cystitis. A blocked bladder rapidly becomes a serious emergency and in all cases when there is any doubt about your cat's ability to pass urine properly he (blockages are much more common in male cats but can occur in females too) should be examined as soon as possible.