MIT Health Thanksgiving holiday hours
Thursday, 11/27: All services closed
Friday, 11/28–Sunday, 11/30: Urgent Care hours: 10 a.m.–4 p.m. All other services closed
24-hour nurse line: 617-253-4481
- What is herpes?
- What are the symptoms of herpes?
- How does herpes spread?
- How do I know if I have herpes?
- How is herpes treated?
- What about other approaches?
- How can I prevent the transmission of herpes?
What is herpes?
Herpes is a very common infection that is caused by one of two different types of viruses:
Herpes simplex virus type 1 (HSV-1)
Herpes simplex virus type 2 (HSV-2)
Both of these viruses can affect the mouth or genitals. HSV-1 has traditionally been associated with an infection in the mouth, while HSV-2 typically infects the genitals. However, recent research shows that the majority of cases of genital herpes involve HSV-1.
HSV-1 is widespread. Among Americans 14–49 years of age, 53.9 percent are infected with HSV-1 and 15.7 percent with HSV-2.
Once someone has been infected with either HSV-1 or HSV-2, the virus remains in the body for life. Most of the time, the immune system suppresses the virus, so it remains dormant, but it still exists in the nerves deep within the skin. Even if your immune system is strong, the virus may start reproducing again, and you may experience an outbreak. Although there is no cure for herpes, certain medications can help prevent or shorten outbreaks. Herpes is not life-threatening and does not affect fertility in women or men.
What are the symptoms of herpes?
Symptoms depend on the type of herpes virus you have and which part of the body it affects. Many people with HSV-1 or HSV-2 don’t experience any symptoms during an outbreak. This is called “asymptomatic infection.” With an asymptomatic infection, you are more likely to unknowingly spread the virus to others. When HSV-1 and HSV-2 do cause symptoms, the types of illness caused by both viruses often look and feel the same. The main difference is that if you are infected with HSV-2 in the genital area, you are more likely to have a relapse or outbreaks than you would be if you were infected with HSV-1.
Symptoms of oral herpes can include:
Pain, burning, tingling, or itching on the lips or mouth.
Cold sores on the lips or around or inside the mouth, which may initially look like shallow ulcers and then crust over. Without treatment, these sores last several days to a few weeks before clearing up on their own.
Symptoms of genital herpes can include:
Pain, burning, tingling, or itching on or around the genitals, buttocks, or inner thighs.
Small blisters on or around the penis, vagina, or anus that usually break and form small scabs before healing within a few days.
Burning sensation while urinating if the sores are near the urethra (the opening through which urine exits the body).
Studies suggest that having genital herpes may also increase your risk of contracting HIV, the virus that causes AIDS. This is because herpes causes open sores on the genitals, which make it easier for the HIV virus to enter the body.
How does herpes spread?
HSV-1 is spread through contact with saliva, including kissing and mouth-to-genital contact (oral sex). HSV-2 is usually transmitted by direct genital-to-genital or genital-to-anal contact. In the past, HSV-2 was responsible for most cases of genital herpes. However, recent research suggests that almost 80 percent of college students with genital herpes have HSV-1, probably due to high rates of oral sex in this group. Remember, a person with herpes can spread the virus even if they don’t have symptoms.
How do I know if I have herpes?
The best way to determine if someone is infected with HSV-1 or HSV-2 is to perform a laboratory analysis on a sample from a fresh herpes sore. But, because not everyone with herpes has symptoms, your clinician may, instead, use a blood test that can detect antibodies to herpes viruses. A blood test can show if you have herpes and, if so, whether it’s HSV-1 or HSV-2. However, a blood test cannot tell you what part of your body the virus will affect.
If you want to be tested for herpes, ask your clinician. A standard screening for sexually transmitted diseases may not include herpes unless you specifically ask.
Remember, however, that HSV-1 is a very common virus, and there is a 50–60 percent probability that you will test positive for it. If you are a sexually active adult who has had multiple partners, there is a 10–20 percent probability that you will test positive for HSV-2.
Here are some other things to consider before you get tested:
If you test negative for one or both of these viruses, what will you do to prevent them?
If you test positive for one or both of these viruses, will you tell potential partners before you engage in sexual activity or, in the case of HSV-1, before you kiss or engage in oral sex?
Learning that you have herpes can be confusing and scary. We encourage you to have an in-depth conversation with your healthcare provider before you decide to get tested.
How is herpes treated?
There is no cure for herpes, but antiviral drugs can help you manage outbreaks and relieve symptoms.
There are currently three types of antiviral herpes medications:
Acyclovir (Zovirax)
Famcyclovir (Famvir)
Valacyclovir (Valtrex)
All three drugs are available as pills. Acyclovir is the oldest of the three and is the least expensive.
People with herpes may use antiviral medications in two different ways:
Treatment for outbreaks: Although herpes sores eventually clear up on their own, antiviral drugs can shorten the duration and severity of symptoms. If your healthcare provider prescribes antiviral drugs to treat the symptoms of a herpes outbreak, you will need to take the medication multiple times a day for five days (your clinician will recommend an exact dosage).
Suppressive therapy: Some people choose to take antiviral drugs every day. This is called “suppressive therapy,” and it can decrease the likelihood of herpes outbreaks.
Suppressive therapy may also have other benefits. It may:
Reduce the likelihood of developing asymptomatic outbreaks.
Reduce the risk of transmitting HSV to your sexual partner.
Reduce the risk of contracting HIV, because active HSV can also make you more susceptible to the HIV virus.
If you have herpes, speak with your healthcare provider to determine if suppressive antiviral therapy is right for you.
What about other approaches?
People have claimed that certain supplements or other alternative approaches can successfully treat or prevent herpes, but there is no good evidence that these approaches are effective. Stress and illness can weaken your immune system, making you more susceptible to herpes, but we still don’t know whether maintaining a healthy lifestyle can protect against outbreaks.
How can I prevent the transmission of herpes?
The best way to prevent transmitting or contracting genital herpes is to avoid sexual contact completely or to be in a monogamous relationship with someone who has tested negative for the virus. However, for many people, neither option is realistic.
The following tips cannot completely prevent the spread of genital herpes, but they can help to lower your risk of transmission:
Don’t engage in sexual activity with an uninfected partner when you have an outbreak or, if you are uninfected, with an infected partner when they are having an outbreak.
Use a condom for sexual intercourse and foreplay. HSV-2 is transmitted through skin-to-skin contact, not through bodily fluids, so you shouldn’t wait for intercourse to use condoms. When used properly, condoms reduce the risk of herpes transmission by about 50 percent.
Use a barrier such as a condom for oral sex, or a dental dam for oral-vaginal or oral-anal sex, to prevent HSV-1 from being transmitted from the mouth to the genitals or anus.
Wash after sex. The herpes virus is surrounded by a lipid (fatty) coating, which causes it to be inactivated by soap. More research needs to be done, but it’s possible that washing with regular soap and water after sex might reduce the risk of contracting herpes.
Take antiviral drugs every day (suppressive therapy), which can decrease the risk of transmission by 50 percent.
Because oral herpes is so common, it can be difficult to prevent transmission. If you are concerned about contracting or transmitting oral herpes, avoid kissing people or sharing items like utensils, washcloths, and lip balm when cold sores are present.