Cold Sores vs Herpes: What Is the Difference?
Quick answer
A cold sore is herpes. It is an infection with herpes simplex virus, most often type 1 (HSV-1), that appears in or around the mouth or lips. What people usually call genital herpes is the same family of virus, caused by HSV-2 or HSV-1. The main difference is where the sores appear, not whether it is "really" herpes.
Does this sound like your sore?
Tick the field marks that match.
The first four points are common with cold sores. A sore that appears only inside the mouth may be something else, so ask a clinician to look at it. This is not a diagnosis.
Plenty of people are surprised to learn that a cold sore and herpes are the same thing. Some get tested for something unrelated and are told “HSV-1”, then wonder what it means. If this is you, you are in very large company, and the explanation is simpler than it first sounds.
Is a cold sore the same as herpes?
Yes. Cold sores are caused by the herpes simplex virus. There are two types:
- HSV-1, which mainly causes infections in or around the mouth (oral herpes or cold sores).
- HSV-2, which spreads through sexual contact and causes genital herpes.
HSV-1 can also cause genital herpes, so “cold sore” and “herpes” are not two different conditions. A cold sore is oral herpes, and what people usually mean by “herpes” is genital herpes.
What is the actual difference between oral and genital herpes?
Mostly where it happens and which type is more likely.
- Oral herpes appears in or around the mouth or lips. It is most often HSV-1.
- Genital herpes appears around the genitals or anus. It is most often HSV-2, though HSV-1 is an increasing cause.
The WHO notes that HSV-1 is mainly spread by oral contact but can also cause genital infection through oral sex. CDC notes that an increasing proportion of genital herpes infections are attributed to HSV-1.
Does having a cold sore mean I did something wrong?
No. The WHO estimates that 3.8 billion people under 50, or 64% of the global population, have HSV-1 infection. Most HSV-1 infections are acquired during childhood. Many people never have symptoms, and many don’t realise they have it.
A cold sore says nothing about how many partners someone has had or how careful they are. There is no reason to feel shame about it.
Can a cold sore cause genital herpes?
It can. If you have oral HSV-1 and give oral sex, especially when a sore or tingling is present, the virus can pass to a partner’s genitals. The WHO notes that the greatest risk of transmission is when there are active sores, but transmission can also happen from skin that looks normal.
CDC notes that genital HSV-1 tends to have fewer recurrences than genital HSV-2. Either way, it is worth avoiding oral sex and kissing while a sore or tingling is present.
How can I tell a cold sore from a canker sore?
This confuses a lot of people. Cold sores usually appear on or around the lips and often start with tingling. A sore that appears only inside the mouth may be a different problem, so ask a clinician to look at it. A swab can confirm whether it is herpes.
Can I test to find out which type I have?
Yes. A swab of a fresh sore can confirm herpes and identify HSV-1 or HSV-2. A type-specific blood test can show which type you carry, but it can’t say where on your body the infection is. CDC notes that HSV-1 serology does not distinguish oral from genital infection.
CDC does not recommend HSV-2 blood screening for the general population, so think about whether a test would help you, using which STD test do I need. If you decide to test, you can order a blood test online.
What treatment is there?
Herpes can’t be cured, but it is treatable. Antiviral medicine prescribed by a clinician can shorten outbreaks, and daily treatment can reduce how often they come back. Over-the-counter pain medicines may help with discomfort, according to the WHO.
Until a sore has healed, avoid oral contact, including kissing and oral sex, and don’t share items that touched saliva, such as cups or lip balm. CDC and WHO both advise avoiding sexual activity while symptoms are present.
A cold sore is a very common, very manageable condition. Knowing that it is the same virus family as genital herpes takes away some of the mystery.
Get care today if
- You have sores near or in your eye, or eye pain, redness or blurred vision
- You have a fever or feel very unwell along with mouth sores
- A newborn has sores or blisters, or you think the baby may have been exposed to herpes at birth
- Your immune system is weakened, for example by HIV or chemotherapy, and sores are large or slow to heal
Call 911 for a medical emergency. Otherwise, urgent care or your doctor can see you today.
When to test
- While the sore is freshAsk a clinician to swab it (PCR test). It is the most sensitive way to confirm herpes and to tell which type it is.
- If the sore has already healedA swab is no longer possible. A type-specific HSV blood test can show whether you have antibodies to HSV-1 or HSV-2, but it can't tell you where on the body the infection is.
- If you want a blood test after a possible new exposureTesting too early can miss a recent infection, so repeat the test about 12 weeks after the possible exposure. You can order a blood test online.
Common questions
Does a cold sore mean I have herpes?
Yes. A cold sore is a herpes infection, usually from HSV-1. The WHO estimates that most adults under 50 worldwide carry HSV-1, and many people have few or no symptoms.
Is HSV-1 an STD?
HSV-1 can be spread through sexual contact, including oral sex, and it can cause genital herpes. But HSV-1 is most often spread through oral-to-oral contact, and infection is most often acquired in childhood, so a cold sore doesn't tell you anything about someone's sexual history.
Can a cold sore give someone genital herpes?
It can. The WHO notes that HSV-1 can cause genital infection through oral sex. Avoiding oral sex when you have a cold sore or tingling lowers the chance.
Is a canker sore the same as a cold sore?
They are different. Cold sores are herpes and appear on or around the lips. If a sore is only inside the mouth, a clinician can look at it and tell you what it is.
Sources
This guide is general information written by a patient advocate using public health sources. It is not a diagnosis. Only a clinician who examines you, or a lab test, can tell you what you have. Read how we write and check our guides.