Generally, the hematuria caused by acute cystitis usually disappears within 1-2 days, but the duration of hematuria in chronic cystitis will be relatively long. The reason why hematuria occurs in cystitis is that in the case of cystitis, bacteria will multiply in the bladder, and the bacteria will destroy the mucosa of the bladder and cause bleeding, and such bleeding will improve as the inflammation gets better. Therefore, patients with hematuria in cystitis need effective antibiotic anti-infective treatment, commonly second- and third-generation cephalosporin antibiotics or second- and third-generation quinolone antibiotics.