Genital herpes is a common sexually transmitted infection caused by herpes simplex virus (HSV) that produces painful sores or blisters on or around the genitals. Over 846 million people between ages 15 and 49 are living with genital herpes worldwide, which is more than 1 in 5 adults, according to WHO estimates. The infection is lifelong, but outbreaks typically become shorter and less frequent over time.
Two Virus Types Cause Genital Herpes
Genital herpes can be caused by either HSV-1 or HSV-2. HSV-2 is the classic culprit, responsible for most recurrent genital infections. But HSV-1, the same virus behind cold sores on the mouth, can also infect the genitals through oral sex. This means someone with a cold sore who performs oral sex can transmit the virus to a partner’s genitals.
The distinction matters because the two types behave differently below the waist. HSV-2 reactivates more efficiently from the nerve clusters near the base of the spine, which is why it tends to cause more frequent recurrent outbreaks in the genital area. HSV-1 genital infections, by contrast, tend to recur less often.
How the Virus Spreads and Hides
After the initial infection, the virus travels along nerve fibers and settles into nerve clusters called ganglia near the base of the spine. There, it enters a dormant state. In some nerve cells the virus replicates and destroys the cell, but in others it goes quiet, producing only a small set of genetic signals that allow it to persist indefinitely without being detected by the immune system.
This is what makes herpes a lifelong infection. The virus isn’t circulating in your blood where the immune system can clear it. It’s tucked away inside nerve cells, reactivating periodically and traveling back down the nerve to the skin surface. When it does, it can cause visible sores or shed invisibly with no symptoms at all.
Transmission happens through direct skin-to-skin contact with an infected area. You can get genital herpes from a partner who has no visible sore and doesn’t know they’re infected, because the virus can shed from the skin surface without causing symptoms. This “asymptomatic shedding” is actually how many new infections occur.
What an Outbreak Looks and Feels Like
The first outbreak is usually the worst. It often begins with tingling, itching, or burning in the genital area, followed by the appearance of small blisters or open sores. These can show up on the genitals, buttocks, or thighs. Some people also experience flu-like symptoms during a first episode: fever, body aches, and swollen lymph nodes in the groin.
First outbreaks tend to last longer than later ones. In the first year after infection, a genital lesion episode averages about 10 days. That shortens over time: people 1 to 9 years out from their first episode average about 7 days per outbreak, and those 10 or more years out average around 6.5 days. Some outbreaks can be as brief as a single day, while others stretch to three or four weeks, particularly early on.
Many people with genital herpes have mild symptoms or none at all and never realize they’re infected. When recurrent outbreaks do happen, they’re typically less painful and heal faster than the first episode. Some people notice a warning “prodrome” phase, a tingling or itching sensation in the area before sores appear, which can signal that the virus is reactivating.
Common Triggers for Recurrent Outbreaks
Several factors can wake the virus from dormancy. Psychological stress is one of the most well-documented triggers. During high emotional stress, your body releases stress hormones like cortisol and adrenaline, both of which have been shown to play direct roles in prompting the virus to reactivate. Illness, fatigue, and anything that weakens the immune system can have a similar effect. People who are significantly immunocompromised face more frequent and more severe outbreaks.
Sun exposure is another trigger, particularly for oral herpes but relevant to the genital area as well. UV radiation causes a cascade of signals in nerve cells and raises cortisol levels, which may push the virus toward reactivation through a pathway similar to psychological stress. Friction or irritation in the genital area, menstruation, and surgery can also trigger episodes in some people.
How Genital Herpes Is Diagnosed
If you have visible sores, the most reliable test is a swab of the sore analyzed with PCR technology, which detects the virus’s genetic material. This test can also tell you whether the infection is HSV-1 or HSV-2, which is useful for predicting how often outbreaks might recur.
Blood tests look for antibodies your immune system has made against the virus. These are type-specific, meaning they can distinguish between HSV-1 and HSV-2. However, blood tests have important limitations. They’re much less reliable during a primary (first) infection because your body may not have produced enough antibodies yet. In primary genital herpes cases, blood tests for HSV-2 catch only about 13% of infections confirmed by swab testing. For recurrent infections, that sensitivity improves to roughly 73%, since the immune system has had more time to build a detectable antibody response. This is why swab testing during an active outbreak remains the preferred approach.
Treatment and Outbreak Management
Antiviral medications are the standard treatment. They work by interfering with the virus’s ability to copy itself, which shortens outbreaks and reduces their severity. The same medications can be taken daily as suppressive therapy to reduce the frequency of outbreaks and lower the risk of passing the virus to a partner. Daily suppressive antiviral therapy has been shown to decrease HSV-2 transmission rates in couples where one partner is infected and the other is not.
Treatment is most effective when started early, ideally during the prodrome phase or within the first day of sore appearance. For people who experience frequent outbreaks (roughly six or more per year), daily suppressive therapy can significantly cut the number of recurrences. For those with infrequent outbreaks, taking medication only when symptoms appear (episodic therapy) is a reasonable alternative.
Reducing the Risk of Transmission
Condoms reduce the risk of transmission but don’t eliminate it entirely, because the virus can shed from skin not covered by a condom. Combining condom use with daily suppressive antiviral therapy offers better protection than either approach alone. Avoiding sexual contact during active outbreaks, when viral shedding is highest, further reduces risk.
Open communication with sexual partners is a practical step. Because so many people with herpes don’t know they have it, and because the virus can spread without visible symptoms, routine STI testing that includes type-specific herpes serology can help people understand their status.
Genital Herpes During Pregnancy
The biggest concern during pregnancy is the risk of passing the virus to the baby during delivery. That risk varies dramatically depending on when the mother was infected. A woman experiencing her first genital herpes outbreak near the time of delivery carries a transmission risk as high as 57%. For women with a history of recurrent herpes, the risk drops to around 2%.
The difference comes down to the immune system. A first infection means the mother hasn’t yet developed antibodies that can offer the baby some protection. With recurrent herpes, those antibodies are already present and cross the placenta. Women with a history of genital herpes are typically offered suppressive antiviral therapy in the final weeks of pregnancy to reduce the chance of an active outbreak at delivery. If active lesions are present when labor begins, a cesarean delivery is generally recommended to protect the newborn.
Living With Genital Herpes Long Term
For most people, genital herpes becomes a manageable condition over time. The virus doesn’t damage organs or cause systemic health problems in people with healthy immune systems. Outbreaks tend to decrease in both frequency and severity as years pass. The average shedding episode also shortens modestly over time, from about 5.4 days in the first year to 4.3 days after a decade or more.
The emotional impact of a diagnosis often outweighs the physical symptoms. Stigma around herpes remains disproportionate to the actual health effects of the virus, especially given how common the infection is. Many people find that once they understand the condition, learn to recognize their triggers, and have a treatment plan in place, herpes becomes a minor, infrequent inconvenience rather than a defining health issue.