Frequent urination after removal of a urinary catheter is relatively common in clinical practice. In most cases, it is caused by irritation of the urethral mucosa by the catheter and congestion and edema of the urethral mucosa. You can drink a lot of water and let the urine flush the urethra, and most of them can return to normal as the mucous membrane of the urethra recovers. If it does not ease after drinking more water, it is best to go to the urology department of a regular public hospital for further consultation and examination of urinary routine and urological ultrasound and measurement of residual urine volume. If there are varying degrees of leukocytosis in the urine and it is accompanied by frequent, urgent and painful urination, it is due to urinary tract infection, which should be treated with oral cephalosporin or quinolone antibiotics in addition to drinking more water. If there is an increase in residual urine, accompanied by dyspareunia and difficulty in urination, it indicates lower urinary tract obstruction and can be treated with oral tamsulosin hydrochloride extended-release capsules.