Herpes causes blisters or open sores on or around the mouth, genitals, or anus, but many people with the virus have symptoms so mild they don’t recognize them as herpes at all. Two types of herpes simplex virus cause the infection: HSV-1, which typically affects the mouth, and HSV-2, which typically affects the genitals. Globally, more than 1 in 5 adults between 15 and 49 have a genital herpes infection, and the majority of oral herpes infections are acquired in childhood.
The Two Types of Herpes
HSV-1 is the virus most people associate with cold sores. It spreads through oral contact, mainly via saliva or skin around the mouth. But HSV-1 can also spread to the genitals through oral sex, which is why a significant share of genital herpes cases are actually caused by HSV-1 rather than HSV-2.
HSV-2 spreads through sexual contact and almost exclusively causes genital herpes. The symptoms of both types look similar, and you can’t tell them apart by appearance alone. The key difference is behavioral: HSV-2 recurs more frequently when it infects the genitals, while genital HSV-1 tends to produce fewer repeat outbreaks over time.
What a First Outbreak Feels Like
The first herpes outbreak is almost always the worst. It tends to be more painful, last longer, and produce more sores than any outbreak that follows. Many people also experience whole-body symptoms during this initial infection, including fever, headache, muscle aches, and a general feeling of being unwell. These flu-like symptoms are most noticeable in the first three to four days.
Locally, you may notice pain, itching, or burning in the affected area before sores appear. For genital herpes, this can include painful urination, vaginal or urethral discharge, and swollen, tender lymph nodes in the groin. For oral herpes, sores usually form on or around the lips, though they can appear inside the mouth as well. The blisters typically cluster together, rupture after a day or two, and leave shallow open sores (ulcers) that gradually crust over and heal. The entire process from first symptoms to full healing generally takes one to three weeks, depending on your immune response and whether you start antiviral treatment.
Recurrent Outbreaks
After the first infection, the virus travels to nerve cells near the base of the spine (for genital herpes) or near the ear (for oral herpes), where it stays permanently. Periodically, it reactivates and travels back to the skin surface, causing a new outbreak.
Recurrent outbreaks are typically milder and shorter than the first, lasting three to seven days. The flu-like symptoms that accompany a primary infection are usually absent or barely noticeable. You might get just one or two sores instead of a full cluster, and they tend to heal faster. Some people have several recurrences a year, while others may only experience one or two in a lifetime. The frequency generally decreases over the years.
The Warning Phase Before Sores Appear
Many people learn to recognize a warning phase, called the prodrome, that occurs hours to a day or two before visible sores break out. This typically feels like localized tingling, burning, or a pins-and-needles sensation in the area where sores are about to form. Starting antiviral medication during this window can shorten the outbreak or sometimes prevent sores from fully developing.
Subtle and Easily Missed Symptoms
Not everyone gets the textbook cluster of blisters. Herpes can show up as a small crack or fissure in the skin, mild redness, or irritation that looks like chafing. Some people mistake it for a yeast infection, an ingrown hair, or a razor burn. These atypical presentations are one reason herpes is frequently misdiagnosed or overlooked entirely.
Many people with herpes never develop noticeable symptoms at all. They carry the virus without knowing it, which is one of the main reasons it spreads so easily. Research from the University of Washington found that even people without symptoms periodically shed the virus from the skin surface. In the early months after a genital HSV-1 infection, participants shed the virus on about 12% of days. By 11 months, that rate dropped to 7%, and by two years, it fell further to around 1.3% of days. In most of these instances, participants had no symptoms while shedding.
Oral Herpes Symptoms
Oral herpes typically appears as cold sores or fever blisters on or around the lips. During a first infection, especially in children, sores can also form on the gums, tongue, and roof of the mouth, sometimes accompanied by sore throat and swollen glands in the neck. Eating and drinking can be painful.
Recurrent cold sores usually appear in the same spot each time, often at the border of the lip. A tingling or itching sensation at the site is the most common early warning sign. The blister fills with fluid, breaks open, crusts over, and heals within about a week to 10 days.
Genital Herpes Symptoms
Genital herpes sores appear as bumps, blisters, or open ulcers on or around the genitals, anus, buttocks, or inner thighs. The sores follow the same progression as oral herpes: fluid-filled blisters that rupture into shallow ulcers, then crust and heal. Pain and itching at the site are the hallmark local symptoms. Urination can sting if urine touches open sores, and some people notice unusual discharge.
Swollen lymph nodes in the groin are common during a first genital outbreak and occasionally during recurrences. Because genital sores are not always visible, particularly if they’re inside the vagina, on the cervix, or inside the anus, some people experience pain or discomfort without ever seeing a sore.
Serious Complications
For most adults, herpes is uncomfortable but not dangerous. In rare cases, however, the virus can cause more serious problems. It can infect the eyes, leading to pain, light sensitivity, and blurred vision that requires prompt treatment to prevent damage. It can also, in uncommon cases, cause viral meningitis, with symptoms like severe headache, stiff neck, and sensitivity to light.
The greatest risk is to newborns. Neonatal herpes can develop if a baby is exposed to the virus during delivery, and symptoms can appear any time within the first four to six weeks of life, though they almost always show up within the first four weeks. Signs include fluid-filled blisters on the skin, in the mouth, or around the eyes, along with difficulty feeding, breathing problems, and unusual behavior. Neonatal herpes can affect the brain and is a medical emergency.
How Herpes Is Confirmed
Because herpes symptoms overlap with other conditions, a visual exam alone is not always reliable. The most accurate way to confirm herpes is a swab test taken directly from an active sore, which can identify the virus and determine whether it’s HSV-1 or HSV-2. Blood tests can detect antibodies to the virus, which is useful if you’ve never had a visible outbreak but want to know your status. Blood tests do have limitations: they can miss very recent infections (antibodies take weeks to develop) and don’t tell you where on the body the virus is active.
Knowing which type you have matters, because it affects how often you can expect recurrences and how you discuss transmission risk with partners. Genital HSV-2 recurs more frequently than genital HSV-1, and both shed asymptomatically, meaning you can transmit the virus even when you have no sores.