Genital Herpes Symptoms: Recognizing an Outbreak and What to Do Next

What does a first herpes outbreak typically feel like?

The first episode of genital herpes is usually the most intense. Symptoms typically appear two to twelve days after initial exposure and may include:

• Local symptoms: clusters of small blisters or ulcers on or around the genitals, buttocks, inner thighs, or anus; a burning or tingling sensation before sores appear; pain or discomfort in the affected area
• Systemic symptoms (more common in a first episode than in recurrences): fever, headache, muscle aches, and swollen lymph nodes in the groin
• Urination pain: if sores are near the urethra, urination can be very painful

The sores typically crust over and heal within two to four weeks without treatment, though antiviral medication speeds healing and reduces severity 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk. Prodromal symptoms — tingling, itching, or burning at the site before sores appear — are common and signal the beginning of an episode 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk2Ref 2Plunkett M, Neville CT, Chang JG (2024).Genital Herpes: Rapid Evidence Review.Prodromal symptoms before outbreaks, suppressive antiviral therapy options, no vaccine available, and clinical guidance on genital herpes management.

What do recurring outbreaks feel like?

After a first episode, HSV remains dormant in nerve cells and can reactivate throughout life. Recurrences are typically shorter (three to seven days), milder, and less likely to include systemic symptoms like fever. Outbreak frequency varies widely: some people have several per year; others rarely or never have a recurrence they recognize.

Common triggers for reactivation include illness, physical stress, sun exposure, menstruation, and immune suppression — though outbreaks can also occur with no identifiable trigger 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk. Over time, many people find that outbreak frequency decreases.

Does herpes always cause visible symptoms?

No — this is one of the most clinically important features of genital herpes. A large proportion of people infected with HSV-2 have no recognized symptoms or very mild symptoms they attribute to something else 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk3Ref 3Tronstein E, Johnston C, Huang ML, Selke S, Magaret A, Warren T, Corey L, Wald A (2011).Genital Shedding of Herpes Simplex Virus Among Symptomatic and Asymptomatic Persons With HSV-2 Infection.Asymptomatic HSV-2 shedding occurs on approximately 10% of days even without visible lesions; most transmission occurs from asymptomatic individuals; condom use and antiviral therapy each reduce shedding. Viral shedding — during which the virus can transmit to a partner — occurs even when there are no visible sores, a phenomenon called asymptomatic shedding.

A landmark study found that asymptomatic shedding occurred on approximately 10% of all days in people with HSV-2, meaning the virus was present on genital skin even with no lesions 3Ref 3Tronstein E, Johnston C, Huang ML, Selke S, Magaret A, Warren T, Corey L, Wald A (2011).Genital Shedding of Herpes Simplex Virus Among Symptomatic and Asymptomatic Persons With HSV-2 Infection.Asymptomatic HSV-2 shedding occurs on approximately 10% of days even without visible lesions; most transmission occurs from asymptomatic individuals; condom use and antiviral therapy each reduce shedding. This is why most herpes transmission occurs from people who do not know they are infected or who are not experiencing an active outbreak.

How is herpes diagnosed?

If sores are present, a PCR (polymerase chain reaction) test or viral culture swab of an active lesion is the most accurate way to confirm the diagnosis 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk. PCR is generally preferred because it is more sensitive than culture. Type-specific results (HSV-1 vs HSV-2) help with prognosis counseling since HSV-1 tends to cause less frequent genital recurrences.

When sores are not present, blood tests (type-specific serologic tests) can detect HSV antibodies. However, serologic tests for HSV-2 are imperfect — one commonly used assay has a higher false-positive rate than other serologic tests, and confirmatory testing is sometimes needed 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk. Clinicians generally do not recommend routine serologic screening in asymptomatic people without a specific clinical reason.

Visual inspection alone is not sufficient — other conditions (including contact dermatitis and other STIs) can look similar.

Treatment and managing the long-term picture

There is no cure for herpes, but antiviral medications — primarily acyclovir, valacyclovir, and famciclovir — significantly reduce the severity, duration, and frequency of outbreaks when taken consistently 1Ref 1Centers for Disease Control and Prevention (2021).Herpes Simplex Virus — STI Treatment Guidelines 2021.Clinical presentation of primary and recurrent genital herpes, asymptomatic shedding, PCR as preferred diagnostic test, serologic testing limitations, episodic and suppressive antiviral therapy, and partner transmission risk.

Two main treatment approaches: - Episodic therapy: Taking antivirals at the first sign of an outbreak to shorten its duration - Suppressive therapy: Taking antivirals daily to reduce overall outbreak frequency and lower the risk of transmitting the virus to a partner

Daily suppressive therapy (typically valacyclovir 500 mg once daily) has been shown in a randomized controlled trial to reduce HSV-2 transmission to uninfected partners by approximately 50% 4Ref 4Corey L, Wald A, Patel R, Sacks SL, Tyring SK, Warren T, Douglas JM Jr, Paavonen J, Morrow RA, Beutner KR, Stratchounsky LS, Mertz G, Keene ON, Watson HA, Tait D, Vargas-Cortes M (2004).Once-Daily Valacyclovir to Reduce the Risk of Transmission of Genital Herpes.Randomized controlled trial: daily valacyclovir 500 mg reduced HSV-2 transmission to susceptible partners by approximately 50% compared with placebo in discordant couples. Combined with condom use and open communication about HSV status, suppressive therapy is the standard approach for discordant couples (where one partner has HSV and the other does not).

A herpes diagnosis does not end sexual health or relationships. With appropriate treatment, consistent communication with partners, and routine follow-up, most people with genital herpes lead normal, active lives.