The most likely cause of a hairy bladder wall is obstructive cystitis. Long-term urinary retention or long-term urinary retention, or obstruction of the bladder outlet, resulting in poor urination and combined inflammation can cause the bladder wall to become gross. In this case, you should drink more water, urinate more often, and have routine urine tests to observe whether there is cystitis. If there is cystitis, you should take a broad-spectrum antimicrobial, most commonly levofloxacin, 0.2 grams per dose, orally twice daily, for 7-10 days. If there is bladder outlet obstruction with a large amount of residual urine in the bladder, it is recommended to leave a catheter in place for drainage and be sure to clip and open the urinary catheter regularly while draining the urine so that the function of the bladder is not impaired. If there is bladder outlet obstruction, oral alpha-blockers can be given to improve urination and make urination more fluid.