Feline bladder disease or feline urological (yer-row-logical) syndrome is a disorder of a cat's urinary tract. It is characterized by the presence of mineral crystals (often called 'sand') which can irritate the lining of the urinary tract, plug the urethra (yer-ree-thruh), and form bladder stones. The word 'syndrome' refers to a group of symptoms which can appear individually or in combination. The symptoms associated with feline urological syndrome are frequent urination, straining to urinate, urinating out of the litter box, and blockage of the urinary tract. Blockage of the urinary tract can prevent the kidneys from eliminating poisonous wastes from the body. The bladder becomes very full because urine cannot be eliminated. Depression, weakness, loss of appetite, vomiting, pain, and even death will result if veterinary attention is not obtained. If you believe your cat is experiencing urological problems or for more information on feline bladder disease, contact your veterinarian.