Non-Gonococcal Urethritis (NGU)

Many people with non-gonococcal urethritis (NGU) do not develop symptoms. When symptoms occur, they usually affect the urethra (the tube carrying urine out of the body).

Common symptoms may include:

• Urethral discharge, which may appear clear, white, or cloudy
• Burning or pain when passing urine
• Irritation or discomfort inside the penis

Symptoms in people with a vagina are often less specific and may include discomfort when urinating or changes in vaginal discharge.

Yes, it is common to have non-gonococcal urethritis without noticeable symptoms. Some people do not realise they have it until testing is carried out.

Even without symptoms, the underlying infection may still be passed to sexual partners. Regular sexual health testing is important, particularly after a new partner or possible exposure.

NGU does not always cause visible changes. When signs are present, the most common finding is urethral discharge, which may appear clear, white, or cloudy.

Some people may also notice mild redness or irritation around the urethral opening. However, NGU is often experienced as discomfort or burning rather than obvious visible changes.

Non-gonococcal urethritis mainly affects people with a penis, including men and some transgender or non-binary individuals.

It is most commonly linked to sexually transmitted infections, so anyone who is sexually active can be affected by the infections that cause NGU, regardless of gender.

If left untreated, NGU may sometimes lead to complications, particularly when caused by an underlying sexually transmitted infection.

Possible complications include:

• Epididymitis
• Reactive arthritis
• Ongoing urethral inflammation or discomfort
• Increased risk of passing on or acquiring other sexually transmitted infections

Untreated underlying infections may also increase the risk of complications in sexual partners.

Symptoms of non-gonococcal urethritis can appear within a few days of exposure but more commonly develop between 2 and 4 weeks.

However, many people do not develop symptoms at all. If symptoms occur, they may include discharge from the penis, pain when urinating, or irritation in the urethra.

Non-gonococcal urethritis is most commonly caused by sexually transmitted infections, particularly chlamydia and Mycoplasma genitalium.

Other possible causes include:

• Trichomonas vaginalis
• Viruses such as herpes simplex virus (HSV)
• Bacteria from the mouth or throat after oral sex
• Irritation from soaps, lubricants, or spermicides
• Friction or minor injury to the urethra

In some cases, no clear cause is identified.

Several sexually transmitted infections can cause non-gonococcal urethritis. The most common causes are chlamydia and Mycoplasma genitalium.

Other sexually transmitted infections associated with NGU include:

• Trichomonas vaginalis
• Herpes simplex virus (HSV)
• Adenovirus
• Ureaplasma species (in some cases)

Symptoms may appear similar regardless of the underlying cause, so laboratory testing is often required.

Hormonal changes are not a common cause of non-gonococcal urethritis.

NGU is usually caused by infection or irritation rather than hormone changes. However, lower oestrogen levels, particularly during menopause, can cause thinning and irritation of the urethral lining. This is usually referred to as atrophic urethritis, rather than NGU.

NGU primarily refers to urethral inflammation in people with a penis. However, some genital or vaginal infections may contribute to urethral symptoms or be associated with transmission of infections linked to NGU.

These may include:

• Chlamydia
• Mycoplasma genitalium
• Trichomonas vaginalis
• Bacterial vaginosis-associated bacteria
• Herpes simplex virus (HSV)

Vaginal irritation or inflammation may also sometimes contribute to urinary discomfort.

Some urological conditions may cause symptoms similar to NGU or contribute to urethral irritation.

These include:

• Urinary tract infections (UTIs)
• Prostatitis
• Urethral stricture
• Catheter-related irritation or urethral trauma
• Bladder irritation syndromes

Because symptoms can overlap, testing may be needed to distinguish these conditions from sexually transmitted infections.

Certain skin conditions affecting the genital area can irritate the urethra and cause symptoms similar to NGU.

These may include:

• Balanitis
• Eczema
• Psoriasis
• Lichen sclerosus
• Contact dermatitis caused by soaps, lubricants, or other irritants

Inflammation around the tip of the penis can sometimes affect the urethral opening.

ertain lifestyle and environmental factors may irritate the urethra and contribute to NGU-like symptoms.

Examples include:

• Scented soaps, shower gels, or spermicides
• Irritation from lubricants or condoms
• Friction from vigorous sexual activity or masturbation
• Tight clothing or irritating laundry products
• Dehydration, which may make urine more irritating

Because irritation and infection can cause similar symptoms, testing may still be recommended.

The risk of NGU is higher with sexual exposure to infections that commonly cause urethritis.

Factors that may increase risk include:

• Unprotected vaginal, anal, or oral sex
• Having a new sexual partner or multiple partners
• Previous sexually transmitted infections
• Exposure to irritants such as soaps or lubricants
• Delayed treatment of symptoms

Some infections, including Mycoplasma genitalium, may cause more persistent symptoms or be harder to treat.

You can reduce the risk of non-gonococcal urethritis by practising safer sex and avoiding irritation to the urethra.

Ways to reduce risk include:

• Using condoms during vaginal, anal, and oral sex
• Having regular sexual health testing, especially with new partners
• Avoiding sharing sex toys or cleaning them properly between uses
• Avoiding products that irritate the genital area, such as scented soaps or spermicides

Because NGU can occur without symptoms, regular testing may help detect infections early.

The underlying cause of non-gonococcal urethritis is usually investigated using a combination of symptoms, examination findings, and laboratory testing.

Common investigations include:

• A first-catch urine sample
• Urethral swab testing, if appropriate
• NAAT/PCR testing for infections such as chlamydia, Mycoplasma genitalium, and Trichomonas vaginalis

These tests help confirm urethral inflammation and identify possible infectious causes so that appropriate treatment can be recommended.

The most common tests for non-gonococcal urethritis are a first-catch urine sample and, in some cases, a urethral swab.

Investigations may include:

• NAAT/PCR testing for chlamydia and Mycoplasma genitalium
• Testing for Trichomonas vaginalis where clinically indicated
• Herpes simplex virus (HSV) testing if ulcers or sores are present

You may be advised not to urinate for 1–2 hours before testing to improve sample quality.

An accurate diagnosis depends on symptoms, examination findings, and appropriate testing.

Factors that can help include:

• Describing symptoms clearly, such as discharge or pain when urinating
• Providing a sexual history, if relevant
• Avoiding urination for 1–2 hours before a urine sample
• Having recommended laboratory tests to identify the cause

Because symptoms can overlap with other conditions, testing is important to confirm NGU and rule out other infections.

Yes. Several infections and non-infectious conditions can cause symptoms similar to NGU.

These include:

• Gonorrhoea
• Urinary tract infections (UTIs)
• Thrush or fungal irritation
• Chemical or friction-related irritation
• Other sexually transmitted infections, including Mycoplasma genitalium or Trichomonas vaginalis

Because symptoms often overlap, laboratory testing is usually needed to identify the underlying cause accurately.

Diagnosis is usually based on symptoms, examination, and laboratory testing. In some cases, a clinician may examine a urethral swab under a microscope to look for signs of inflammation.

Additional testing may be recommended if symptoms persist, return, or if a less common cause is suspected.

No, a physical examination alone cannot confirm non-gonococcal urethritis.

An examination may identify signs such as discharge or redness, but tests are needed to confirm inflammation and identify the underlying cause. This usually involves a urine sample or swab.

No, non-gonococcal urethritis cannot be diagnosed at home.

Although symptoms such as discharge or pain when urinating may suggest NGU, testing is needed to confirm the diagnosis and identify the cause. Home STI tests may detect some infections, but they do not confirm urethral inflammation itself.

Yes, non-gonococcal urethritis can usually be treated successfully with antibiotics. Symptoms often improve within 1–2 weeks after starting treatment.

Treatment depends on the underlying cause, but antibiotics such as doxycycline are commonly used. It is important to complete the full course of medication, even if symptoms improve sooner.

Treatment for non-gonococcal urethritis usually involves antibiotics directed at the suspected or confirmed underlying cause.

Common treatment options may include:

• Doxycycline
• Azithromycin in selected situations
• Alternative antibiotics if symptoms persist or resistant infections are suspected

Treatment choice depends on the likely cause, symptoms, and current clinical guidance.

Treatment for non-gonococcal urethritis is usually short, often lasting around 7 days, depending on the antibiotic prescribed.

Symptoms may improve sooner, but it is important to complete the full course of treatment to reduce the risk of persistent infection or recurrence.

Yes, non-gonococcal urethritis can usually be cured with appropriate treatment.

Most people recover fully after antibiotics, particularly when treatment is started promptly and the full course is completed. If symptoms continue or return, further testing may be needed to check for persistent infection or another cause.

Sexual partners may also require testing and, treatment dependes on the suspected or confirmed underlying cause of NGU.

This helps reduce the risk of reinfection and onward transmission. Avoiding sexual contact until treatment is completed and symptoms have settled is usually recommended.

The long-term outlook for non-gonococcal urethritis is usually very good, particularly when the underlying cause is identified and treated promptly.

Most people recover fully without long-term complications. Persistent or recurrent symptoms can sometimes occur, particularly with reinfection, untreated partners, resistant infections, or non-infectious causes of urethral irritation.

Complications are uncommon but may include epididymitis or ongoing urethral discomfort if underlying infections are left untreated.

No, treatment does not provide immunity against non-gonococcal urethritis.

You can develop NGU again if you are exposed to the same infection or trigger in the future. Reinfection can happen if a sexual partner has not been tested or treated, or if there is a new exposure.

Yes, there are steps you can take to reduce the risk of NGU returning.

These include:

• Completing the full course of prescribed treatment
• Ensuring sexual partners are tested and treated if needed
• Avoiding sexual contact until treatment is completed
• Using condoms during sex
• Avoiding products that may irritate the genital area, such as scented soaps or spermicides

If symptoms return, further testing may be needed to check for reinfection or a different cause.

If NGU is caused by a sexually transmitted infection, it is important to inform recent sexual partners so they can consider testing and treatment.

This helps reduce the risk of reinfection and prevents infections from being passed on unknowingly. Some people with infections linked to NGU may have no symptoms, so partners may not realise they are affected.

NGU itself is not commonly discussed in pregnancy, but the infections that cause it may increase the risk of complications if left untreated.

Possible risks may include:

• Premature birth or early labour
• Premature rupture of membranes (waters breaking early)
• Infection passed to the baby during birth
• Eye or respiratory infections in the newborn, depending on the cause

Prompt testing and pregnancy-safe treatment can help reduce these risks.

Non-gonococcal urethritis is a term more commonly used for urethral inflammation in people with a penis. However, infections linked to NGU, such as chlamydia, can occur during pregnancy and are not uncommon.

Because some infections may not cause symptoms, testing during pregnancy may be recommended if there are symptoms, risk factors, or possible exposure.

Yes. Treatment during pregnancy is directed at the underlying infection, and pregnancy-compatible antibiotics can usually be prescribed safely.

Antibiotic choice depends on the infection identified, stage of pregnancy, and current clinical guidance.

Some antibiotics commonly used outside pregnancy, such as doxycycline, are generally avoided during pregnancy.

Reducing the risk of infections linked to NGU during pregnancy involves safer sex practices and early testing.

Ways to reduce risk include:

• Using condoms during sex
• Having sexual health testing if symptoms or exposure are suspected
• Ensuring partners are tested and treated if needed
• Seeking medical advice promptly for symptoms such as discharge or pain when urinating

Early treatment can help reduce the risk of pregnancy-related complications.

Infections associated with NGU may occasionally affect postpartum recovery if left untreated, particularly if complications such as pelvic or genital tract infection develop.

The infections linked to NGU are not generally considered breastfeeding-associated infections. If treatment is required while breastfeeding, a clinician can recommend antibiotics considered compatible with breastfeeding.