3-year-old girl urethra with worms, may be urethra with pinworms, urethra infected with trichomonas urethritis, etc., according to the cause of the general treatment, drug treatment. 1. urethra with pinworms: and usually do not pay attention to hygiene, when the pinworms into the urethra, may cause urethral discomfort symptoms, after diagnosis should use albendazole and other drugs for deworming treatment, usually wear clothes with high temperature disinfection, to avoid cross-infection. 2. Trichomonas vaginitis: it is a kind of urethritis caused by Trichomonas infection, after diagnosis, you can insist on washing the urethra with lukewarm water, and often use boiling water to scald the private things or put them in the sun for exposure. If the symptoms are serious, you can use drugs such as metronidazole for treatment. If you find that your child often has urethral discomfort, urethral redness and other symptoms, you need to consult a doctor to clarify the diagnosis, and follow the doctor’s instructions to carry out targeted treatment, so as not to miss the opportunity for treatment. All of the above drugs should be used under the guidance of a doctor.