Penile Discharge — Causes and What to Do

Penile discharge — sometimes called urethritis — is one of the most concerning symptoms men encounter. The good news: it's almost always treatable, often within days of seeing a doctor.

Here's how to think about it, what causes it, and what to expect.

The short answer

What the discharge tells you

Color and consistency

• Thick, yellow-green pus → gonorrhea most likely
• Clear or whitish, watery → chlamydia or Mgen most likely
• Frothy, greenish → possible trichomoniasis
• Clear and intermittent → may not be infectious
• Bloody → unusual; needs evaluation
• Foul odor → bacterial infection likely

Amount

• Profuse, dripping → often gonorrhea
• Just a small amount → could be chlamydia, Mgen, or non-infectious
• Morning only ("morning drop") → typical of chlamydia

Timing

• 24-48 hours after exposure → think gonorrhea
• 1-3 weeks after exposure → think chlamydia
• 2-4 weeks → could be either or other

STI causes

Gonorrhea

• Thick yellow-green discharge — classic
• Severe burning with urination
• Sometimes testicular pain
• Visible to others (can stain clothing)
• Onset typically 2-10 days after exposure

See gonorrhea treatment + antibiotic resistance.

Chlamydia

• Clear to white discharge, less abundant
• Often just morning drop
• Mild burning
• Up to 50% asymptomatic
• Onset 1-3 weeks after exposure

See chlamydia symptoms in men.

Mycoplasma genitalium

• Often confused with chlamydia
• Persistent or recurrent after standard chlamydia treatment
• Discharge variable
• Becoming increasingly important

See Mycoplasma genitalium.

Trichomoniasis

• Less common in men
• Often mild urethritis
• Frothy or unusual discharge sometimes
• Men often asymptomatic

Other STI causes

• LGV (in MSM with proctitis-associated urethritis) — see LGV
• HSV (usually with lesions, not just discharge)

Non-STI causes

Urinary tract infection (UTI)

• Less common in healthy young men
• Can cause urethral inflammation
• Different bacteria from STIs

Prostatitis

• Inflammation of prostate
• Pelvic pain
• Sometimes pus-like discharge
• Can be acute or chronic

Reactive (non-infectious) urethritis

• After mechanical trauma
• Allergic reaction (latex, lube, soap)
• Chemical irritation

Smegma

• Buildup under foreskin in uncircumcised men
• White, cheese-like
• Hygiene issue, not infection
• Wash regularly

Pre-ejaculate or seminal fluid

• Clear discharge during sexual situations
• Normal physiological response
• Not pathological

Lubricant from previous sex

• Visible later
• Not infection

Phimosis-related discharge

• In men with tight foreskin
• Hygiene difficulty
• Sometimes superinfected

When to see a doctor

Same-day care

• Any new persistent discharge
• Discharge with fever
• Discharge with severe pain
• Discharge with blood
• Discharge with severe testicular pain (could be epididymitis)
• Discharge with rectal symptoms (could be LGV)

Within 1-2 days

• New discharge with no severe symptoms
• After exposure to known STI

Less urgent (but still see doctor)

• Intermittent discharge
• Discharge improving on its own
• Hygiene-related buildup

What happens at the clinic

History

• When did it start?
• What does it look like?
• Sexual exposure history
• Other symptoms
• Medications, allergies

Examination

• Visual inspection
• Genital exam
• Sometimes pelvic exam in pelvic pain
• Often examination of penis tip

Tests

• Urine NAAT for chlamydia, gonorrhea, Mgen (sometimes)
• Urethral swab (rare now since urine works well)
• Gram stain of discharge (rapid; shows bacteria type)
• Urinalysis for UTI
• Throat/rectal swab if relevant

Empiric treatment

• Often started before tests come back
• Standard regimen for urethritis (covers chlamydia + gonorrhea)
• Adjusted if specific organism identified

Standard urethritis treatment

Empiric (before knowing specific organism)

• Ceftriaxone 500 mg IM for gonorrhea
• Doxycycline 100 mg twice daily for 7 days for chlamydia + Mgen partial coverage

If gonorrhea confirmed

• Ceftriaxone IM
• Plus doxycycline as above

If chlamydia confirmed

• Doxycycline 100 mg twice daily for 7 days
• Or azithromycin 1 g single dose (alternative)

If Mgen confirmed

• Two-step: doxycycline 7 days, then moxifloxacin 7 days
• See Mgen partner protocols + treatment failure

If trichomoniasis

• Metronidazole 2 g single dose
• Or 7-day course

After treatment

Symptom resolution

• Gonorrhea: usually 24-72 hours
• Chlamydia: usually 3-7 days
• Mgen: variable; sometimes longer

What if symptoms persist?

• Possible reinfection from untreated partner
• Possible treatment failure
• Possible Mgen if chlamydia treatment didn't work
• Possible different organism
• Need re-evaluation

Avoid sex

• 7 days after starting treatment
• Until partner(s) treated
• See sex after STI treatment

Partner notification

• All partners from past 60 days
• Need testing AND treatment
• "Expedited partner therapy" available for some STIs

Re-testing

• At 3 months for reinfection
• Earlier if symptoms recur

Common patterns

Multiple partners + new discharge

• High suspicion for STI
• Need full panel
• Treat empirically
• Partner notification

Long-term partner + new discharge

• Could indicate partner has new STI
• Could indicate other cause
• Same workup

Already treated for "chlamydia" + persistent symptoms

• Think Mgen
• Re-test
• Different treatment

Discharge + rectal symptoms

• LGV in MSM
• Different treatment needed
• See LGV

What to do at home before/during visit

Do

• Note the appearance of discharge
• Take a photo if helpful
• Note when it started
• Note other symptoms
• Avoid sex until evaluated
• Tell sexual partners

Don't

• Self-medicate with leftover antibiotics
• Ignore symptoms hoping they resolve
• Have sex
• Wait weeks before seeking care
• Assume it's "just irritation"

Special situations

After receptive anal sex

• Rectal swab also needed
• Throat swab if oral sex
• LGV consideration if MSM

After oral sex received

• Throat swab may be needed
• Standard urethritis treatment

Recurrent urethritis

• Different from single episode
• May need extensive workup
• Consider Mgen, resistant gonorrhea
• Refer to urology or infectious disease

Discharge + epididymitis

• Testicular pain + discharge
• Requires longer treatment
• Often need scrotal exam + ultrasound

When discharge isn't really discharge

Sometimes people think they have discharge but they actually have:

• Sebum/skin oil (especially under foreskin)
• Soap residue after showering
• Lubricant from previous sex
• Normal pre-ejaculate (clear, during sexual situations)

If unsure, an exam can clarify.

Bottom line

Penile discharge:

• Almost always treatable — usually with single antibiotic visit
• STI is most common cause — gonorrhea, chlamydia, Mgen
• Don't self-treat — get proper diagnosis
• Partner treatment matters — prevent reinfection
• Re-test if symptoms persist — could be Mgen or resistant organism

If you have new penile discharge, see a doctor within 1-2 days. The treatment is usually quick, and the longer you wait, the more likely you transmit to others and develop complications.

For more, see chlamydia symptoms in men, gonorrhea treatment + antibiotic resistance, Mycoplasma genitalium, sex after STI treatment, and our chlamydia pillar guide.