The causes of cystitis in cats include pathogenic microbial infection, spread of inflammation in adjacent organs, irritation or damage to the bladder mucosa, etc. Cystitis in cats is a relatively common and difficult-to-treat chronic disease. Urinary tract infection, bladder stones, and urinary tract cancer can all cause cystitis. The most effective prevention method is to let the cat drink more water, which can help the cat dilute the urine and speed up the disappearance of symptoms.