Pus inside the urethra may be obvious purulent secretion overflow from the urethra, which may be caused by a variety of symptoms such as urinary tract infection, cystitis, etc. It is necessary to do routine blood tests or routine urine tests to make a clear diagnosis. 1. Urinary tract infection: it is an inflammatory reaction of the urinary tract epithelium to the invasion of bacteria, usually bacteriuria, pyuria, and may lead to pus inside the urethra, which can be treated with drugs such as cefadroxil and cefazolin under the guidance of a doctor. 2. Cystitis: it is the bacterial erosion of bladder tissue, thus appearing inflammation of the urinary system, may appear frequent urination, urinary urgency, urinary pain and other symptoms, may also lead to pus inside the ureter, can be under the guidance of the doctor to take norfloxacin, ciprofloxacin and other quinolone antibiotics for treatment. Drink more water, urinate regularly, eat less spicy and stimulating food, eat mainly light, pay attention to private hygiene. If you have any symptoms of discomfort, you should go to the hospital in time, under the guidance of the physician, to identify the cause and then give targeted treatment.