NGU sometimes quiets down on its own, but "symptoms fade" is not the same as "infection cured." The organisms behind it — most often chlamydia or Mycoplasma genitalium — can persist silently, keep spreading to partners, and lead to complications. Treatment is short, cheap, and the only reliable way to clear it.
with the right treatment
testing, not symptoms, decides
| Item | Value |
|---|---|
| Curable? | yes — with the right treatment |
| Tested by | NAAT / lab |
| Often | no symptoms |
| If you may have it | get tested — testing, not symptoms, decides |
What is NGU?
NGU stands for non-gonococcal urethritis — inflammation of the urethra (the tube that carries urine and semen out of the body) that isn't caused by gonorrhea. It's a syndrome rather than a single germ. Several organisms can trigger it: Chlamydia trachomatis, Mycoplasma genitalium, and sometimes Trichomonas vaginalis, herpes simplex virus, or adenovirus. In roughly half of cases, no organism is ever identified CDC STI Guidelines, 2021. Whether NGU clears on its own depends heavily on which bug is driving it, and you usually can't tell from symptoms. Read more on the full range of ngu causes if you want the breakdown by organism.
What are the symptoms — and the silent reality?
The classic triad is urethral discharge (mucoid or cloudy, sometimes thick and pus-like), painful or burning urination, and itching or irritation inside the urethra. NGU mainly shows up in men, where the inflamed urethra produces noticeable discharge and discomfort, often worst in the morning.
Some infections cause no symptoms at all. You can carry chlamydia or M. genitalium with a urethra that feels completely normal. So when symptoms ease up after a week or two, that's frequently the inflammation calming down while the infection stays put. The germ can still be there, still transmissible, and still capable of doing damage you can't feel.
How does NGU spread?
The infectious causes spread through vaginal, anal, or oral sex when genital fluids and mucous membranes make contact. Because chlamydia and M. genitalium often ride along without symptoms, people pass them on without knowing, and partners pass them back. Letting NGU ride it out fails because of that cycle: even if your own symptoms vanish, an untreated partner can reinfect you, and you can keep infecting others.
How is NGU diagnosed?
A clinician confirms actual inflammation before calling it urethritis. That means objective evidence: a Gram stain of urethral discharge showing at least two white blood cells per oil-immersion field with no gonococci, or a first-void urine sample that's positive for leukocyte esterase or shows at least ten white blood cells per high-power field. On top of that, a NAAT (nucleic acid amplification test) checks for chlamydia and gonorrhea, and in persistent cases, for M. genitalium.
In practice this is far less involved than it sounds. Most testing comes down to a urine cup, a self-collected swab, or a quick exam, with results usually back in a few days. It's free or low-cost at health departments, Planned Parenthood, and Title X clinics. If you've had a recent exposure, timing matters — see when to test after exposure so you don't test too early and miss it. When you're ready, you can get tested or compare testing providers to find the option that fits your budget and privacy needs.
How is NGU treated?
NGU is curable with antibiotics, and the standard course is short. The CDC recommends doxycycline taken orally twice daily for a week, chosen over single-dose azithromycin because it produces better outcomes and less resistance, particularly against M. genitalium. Single-dose azithromycin remains an alternative. If NGU is persistent or comes back, re-confirm urethritis and test specifically for M. genitalium; if it's positive, treatment is doxycycline followed by a course of moxifloxacin daily for a week.
A few realities worth knowing. Finish the entire course even after you feel better. Ask whether your partner needs treating at the same time, so you don't trade the infection back and forth. For the full regimens and what to expect, see the detailed guide to ngu treatment, and before resuming intimacy, check the guidance on sex with ngu.
Treatment at a glance
| Scenario | Approach |
|---|---|
| First-line NGU | Doxycycline orally twice daily for 7 days |
| Alternative | Azithromycin 1 g single dose |
| Persistent / recurrent, M. genitalium positive | Doxycycline, then moxifloxacin 400 mg daily for 7 days |
| Partners | Refer those from the prior 60 days for evaluation, testing, and presumptive treatment |
What happens if NGU is left untreated?
Even when symptoms fade, an untreated infection can move beyond the urethra and cause complications you don't want to bet against:
- Epididymitis — inflammation of the coiled tube behind the testicle that stores and carries sperm, causing pain and swelling, and potentially affecting fertility.
- Prostatitis — inflammation of the prostate gland, which can bring pelvic pain and urinary symptoms that drag on.
- Reactive arthritis — joint inflammation triggered by the infection, sometimes alongside eye and urinary symptoms.
- Complications in partners — the underlying STI doesn't stop at you. Chlamydia in a partner can ascend to cause pelvic inflammatory disease (PID, infection of the uterus, fallopian tubes, and ovaries), a leading preventable cause of infertility. This is the biggest reason partner treatment matters.
A flare of NGU symptoms may settle, and some viral or self-limited causes do resolve. But you can't tell which case you have without testing, and the downside of guessing wrong falls partly on your partner. Treating it is faster and far cheaper than treating what comes after.
How do you prevent NGU?
For the sexually transmitted causes, condoms used every time lower your risk substantially. Routine STI testing catches the infections that produce no symptoms, before they spread or scar. If you're diagnosed, make sure recent partners get evaluated and treated.
- Use condoms consistently for vaginal, anal, and oral sex.
- Get tested on a routine schedule if you're sexually active, especially with new or multiple partners.
- Refer sex partners from the prior 60 days for evaluation, testing, and presumptive treatment effective against chlamydia.
- Don't resume sex until you and your partner have both completed treatment.
When should you see a clinician?
See a clinician if you notice urethral discharge, burning with urination, or urethral itching — or if a partner tests positive for chlamydia, gonorrhea, or M. genitalium, even when you feel fine. Don't wait for symptoms to "prove" something is wrong; the asymptomatic cases are the ones that cause downstream damage. A diagnosis here is common and treatable, and clinics handle it every day.