1. Straining to Urinate
Feline idiopathic cystitis, also known as bladder inflammation, is the most common cause of lower urinary tract disease in cats. This inflammation, in turn, can lead to straining when urinating. It can eventually even lead to more severe and emergency type of situations like the formation of stones in the bladder or the formation of a urethral plug, which is a life-threatening condition that causes the cat (almost always male) to become "blocked" (i.e., unable to urinate).