bladder stones & urinary obstructions

A urolith is stone-like object that can be found in the bladder and, less commonly, in the kidney, of cats. Some studies have shown that up to 13% of cats with lower urinary tract disease today have uroliths. They can be present without causing any symptoms in the cat, but they are very often associated with hematuria (blood in the urine), pollakuria (increased frequency of urination) and dysuria.

SOURCE: cats.consultinghealth.com