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HSV-1 vs. HSV-2: What's the Difference?

HSV-1 vs. HSV-2: What are the differences?

Concerned about herpes? There are several different types of herpes virus, ranging from the common herpes simplex virus (HSV) to the varicella-zoster virus (herpes zoster, or shingles) and the human cytomegalovirus.

When people think of “herpes,” they usually mean one of the herpes simplex viruses, such as HSV-1 or HSV-2. Below, we’ll explain how these two types of the herpes virus differ from one another, ranging from infection rates to the different ways they affect the body.

The Basics of HSV-1 and HSV-2

Herpes simplex virus 1 and herpes simplex virus 2 are both types of herpes virus. Of the two, HSV-1 is by far the most common, with an estimated 67% of all people under 50 years of age infected with the virus worldwide.

HSV-2 is less common but still widespread, affecting an estimated 11% of people worldwide aged 15 to 49. Infection rates for HSV-1 and HSV-2 vary significantly from country to country, although HSV-1 infection rates are consistently high worldwide.

HSV-1 and HSV-2 are both lifelong infections without any known cure. However, a variety of safe, affordable and highly effective medications are available to treat both types of the virus.

There are several key differences between HSV-1 and HSV-2, ranging from the areas of the body each virus tends to affect to the way the viruses are transmitted.

The Basics of HSV-1

HSV-1 typically infects the lips and mouth, causing oral herpes (cold sores) to develop. It’s an extremely common virus that’s usually transmitted in childhood, usually through contact with a parent or other family member that has the virus.

A majority of people are infected with HSV-1, meaning there’s no need to panic if you find out that you have the virus. Many people are asymptomatic, meaning they carry the virus and can potentially spread it others but don’t have any visible, obvious symptoms.

HSV-1 usually causes outbreaks of herpes around the mouth, most commonly known as cold sores. Between outbreaks, the virus rests dormant in the trigeminal ganglion, a group of nerve cells near the ear.

While HSV-1 usually affects the lips and mouth, it can also spread to the genitals and result in genital herpes. HSV-1 usually spreads to the genitals through oral sex and can spread with or without visible symptoms.

The Basics of HSV-2

HSV-2 typically infects the genitals, causing lesions to develop on and around the genitals and anus. This form of the virus is typically transmitted through sexual activity, although it can also spread from mother to child during childbirth.

Unlike HSV-1, it’s very rare for HSV-2 to spread to the mouth and lips. This form of the herpes virus almost exclusively causes genital lesions. Like HSV-1, many people with HSV-2 have no symptoms and are unaware that they’re infected.

In fact, only 10-20% of people who find out they have HSV-2 claim to have noticed the signs and symptoms of genital herpes before finding out about their infection status.

Between outbreaks, HSV-2 remains dormant in the body. The virus infects the sacral ganglion, a group of nerve cell clusters in the lower spine.

HSV-2 is more common in women than in men, with current studies estimating that 287 million women and 150 million men are infected worldwide. This is because the virus can spread more easily from men to women than vice-versa as a result of anatomical differences.

Symptoms of HSV-1 and HSV-2

HSV-1 and HSV-2 cause similar symptoms. However, because the two forms of the virus infect different parts of the body, their symptoms are usually exclusive to the lips and mouth or to the genitals.

HSV-1 Symptoms

HSV-1 most commonly produces oral herpes (cold sores). People infected with the virus usually go through an initial outbreak shortly after catching the virus. This is usually an intense outbreak that features cold sores and a variety of flu-like symptoms.

An initial outbreak of HSV-1 can last for two to three weeks. Our guide to stopping a cold sore in the early stages goes through the different stages of an HSV-1 outbreak, explaining how a sore can develop, break open and spread infectious fluid before eventually healing.

After the initial outbreak, HSV-1 can reoccur for a variety of reasons. Some people with HSV-1 experience outbreaks every few months, while others only experience outbreaks after a certain trigger event occurs. Many people with HSV-1 experience no symptoms at all.

Although rare, HSV-1 can also cause genital herpes. In this case, the virus infects nerve cells in the lower spine and causes sores to develop on and around the genitals and anus, not the lips and mouth.

HSV-2 Symptoms

HSV-2 almost exclusively causes genital herpes. After becoming infected with the virus, people with HSV-2 typically go through an initial outbreak. The symptoms are similar to an initial HSV-1 outbreak, albeit localized to the genitals rather than the mouth and lips.

The most obvious symptom of HSV-2 is the development genital herpes sores, which can form on the genitals, in the groin and upper thigh area, and around the anus.

Initial HSV-2 outbreaks can include a range of additional symptoms, such as headache, fatigue, glandular swelling and nausea. Many people with HSV-2 mistake the initial symptoms for the flu before the genital herpes lesions become visible.

Like HSV-1, the initial symptoms of an HSV-2 outbreak usually last for two to three weeks. Many people with HSV-2 do not experience any symptoms at all, resulting in many people with HSV-2 remaining unaware that they’re infected.

Complications of HSV-1 and HSV-2

Because HSV-1 is so common, major health complications from the virus are rare. Outbreaks of HSV-1 usually become less intense over time as the body develops an immune response to the virus. It’s also easy to treat HSV-1 outbreaks using antiviral medications.

The same is true of HSV-2. Even in symptomatic people, the body develops its own immune response to the virus over time. HSV-2 symptoms can be treated using antiviral drugs, which speed up the healing process and reduce the frequency of outbreaks.

Despite this, both HSV-1 and HSV-2 can produce some complications. In people with weak or compromised immune systems -- such as people with HIV -- HSV-1 can cause lasting damage to the eyes and brain.

HSV-1 and HSV-2 can both potentially cause neonatal herpes. This is a potentially fatal virus caused by vertical transmission of herpes from mother to child. Neonatal herpes is very rare, affecting between one in 3,000 and one in 20,000 births worldwide.

Finally, both forms of herpes can have a significant social and psychological impact. If HSV-1 causes visible cold sores, it can affect self confidence and quality of life. HSV-2 can result in a significant change in sexual behavior, particularly a loss of sexual self confidence.

Treating HSV-1 and HSV-2

HSV-1 and HSV-2 are both easy and inexpensive viruses to treat. The most widely used drugs for both forms of the herpes virus are antiviral medications, such as valacyclovir (Valtrex) and acyclovir (Zovirax).

Antiviral drugs work by preventing the herpes virus from developing, helping to control herpes outbreaks and reduce the risk of infecting others. Studies show that drugs like valacyclovir are highly effective at speeding up healing from herpes outbreaks and reducing transmission risks.

Our Valacyclovir 101 guide goes into more detail about how valacyclovir can be used to treat both strains of the herpes virus.