What Is Herpes? Everything You Need to Know About HSV-1 and HSV-2

Herpes is a common viral infection caused by the herpes simplex virus (HSV). There are two types: HSV-1, which typically causes oral cold sores, and HSV-2, which usually causes genital herpes. Over half of American adults carry HSV-1, and roughly 1 in 6 have HSV-2. Most people with herpes experience mild or no symptoms and may not know they are infected.

If you've just learned you have herpes — or you're worried you might — I want to start with the most important thing I tell patients: herpes is far more common than most people realize, and a diagnosis does not define your health, your relationships, or your future.

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

HSV-1 is traditionally associated with oral herpes. According to the CDC's herpes surveillance data, approximately 47.8% of people aged 14 to 49 in the U.S. carry HSV-1. HSV-2 prevalence is approximately 11.9%. For a detailed comparison, see our guide on HSV-1 vs HSV-2 differences. Both types can infect either location.

How Common Is Herpes Really?

The majority of American adults carry at least one type. The CDC does not recommend routine herpes screening for the general population precisely because the infection is so common and the psychological impact of diagnosis often exceeds the medical impact.

How Does Herpes Spread?

Herpes transmits through direct skin-to-skin or mucous membrane contact. The most important concept is asymptomatic shedding — the virus can be present on the skin without visible sores. Studies show people with genital HSV-2 shed on approximately 10 to 20% of days without symptoms. An estimated 70% of new infections occur during these periods. For complete details, see our article on how herpes spreads. Herpes does not spread through toilet seats — see our toilet seat myth article.

What Do Herpes Symptoms Look Like?

Many people never develop noticeable symptoms. When symptoms appear, the most recognizable sign is a cluster of small, fluid-filled blisters. A first outbreak is typically the most severe (2–4 weeks). Recurrent outbreaks are milder (3–7 days). For a visual guide, see our article on what herpes bumps look like. Our herpes vs pimple comparison may also help.

Living with Herpes

Antiviral medications (acyclovir, valacyclovir, famciclovir) reduce outbreak frequency by 70–80% and transmission risk by approximately 50%. Combined with condoms, annual transmission risk drops to low single digits.

When to Seek Medical Attention

See a provider for first-time blisters, unusually severe outbreaks, or sores near the eyes (ocular herpes is a medical emergency). Confidential herpes testing is available in all 50 states.

Frequently Asked Questions

Can herpes be cured?

There is currently no cure. Antiviral medications effectively control symptoms and reduce transmission.

Can I spread herpes without an outbreak?

Yes. Approximately 70% of new infections are transmitted during asymptomatic shedding. See our herpes transmission guide.

Is herpes dangerous?

For most healthy adults, no. It can be serious in newborns, immunocompromised individuals, and when it affects the eyes.

Does having herpes mean my partner cheated?

Not necessarily. Herpes can remain dormant for months, years, or decades before a first recognized outbreak.