Yes, you can get an STD from oral sex. Gonorrhea, chlamydia, syphilis, herpes and HPV can all pass between the mouth and the genitals or anus, in either direction. The risk is generally lower than with vaginal or anal sex, and condoms, dental dams, vaccines and regular testing lower it further.
This guide explains which infections spread through oral sex, what oral STI symptoms can look like, how throat testing works and what you can do to protect yourself and your partners. It is based on guidance from the CDC, the NHS, the WHO and Planned Parenthood.
Reviewed by the Fellate editorial team on October 11, 2026.
Which infections can spread through oral sex
Public health bodies such as the CDC and the NHS list several infections that can pass during oral sex. Someone can have an infection in the mouth or throat and pass it to a partner's genitals, or the other way around.
Gonorrhea
- How it can spread orally
- Mouth to genitals and genitals to throat
- Notes
- Throat infections often cause no symptoms
Chlamydia
- How it can spread orally
- Genitals to throat, less often the reverse
- Notes
- Often no symptoms
Syphilis
- How it can spread orally
- Contact with a sore on the mouth or genitals
- Notes
- Sores can be painless and easy to miss
Herpes (HSV 1 and HSV 2)
- How it can spread orally
- Contact with the skin, including when no sores are visible
- Notes
- Cold sores are usually HSV 1 and can pass to the genitals
HPV
- How it can spread orally
- Skin and mucosa contact
- Notes
- Some types are linked to throat cancers, a vaccine is available
HIV
- How it can spread orally
- Possible but the risk is very low
- Notes
- Higher with mouth sores, bleeding gums or other infections
Hepatitis A and B, gut infections
- How it can spread orally
- Mainly through oral and anal contact
- Notes
- Vaccines exist for hepatitis A and B
| Infection | How it can spread orally | Notes |
|---|---|---|
| Gonorrhea | Mouth to genitals and genitals to throat | Throat infections often cause no symptoms |
| Chlamydia | Genitals to throat, less often the reverse | Often no symptoms |
| Syphilis | Contact with a sore on the mouth or genitals | Sores can be painless and easy to miss |
| Herpes (HSV 1 and HSV 2) | Contact with the skin, including when no sores are visible | Cold sores are usually HSV 1 and can pass to the genitals |
| HPV | Skin and mucosa contact | Some types are linked to throat cancers, a vaccine is available |
| HIV | Possible but the risk is very low | Higher with mouth sores, bleeding gums or other infections |
| Hepatitis A and B, gut infections | Mainly through oral and anal contact | Vaccines exist for hepatitis A and B |
Oral STI symptoms worth knowing
Many infections in the throat cause no symptoms at all, which is why testing matters. When symptoms do appear, they can include:
- A sore throat that does not go away, or redness at the back of the throat
- Sores, blisters or ulcers on the lips, mouth or tongue
- Small, painless sores that may be syphilis
- Discharge, burning when peeing, or sores on the genitals after receiving oral sex
- Warts or growths in the mouth or throat, which can be linked to HPV
None of these symptoms prove you have an infection, and many have ordinary causes. If you notice anything unusual after oral sex, avoid sexual contact and see a doctor or a sexual health clinic.
How testing for oral STIs works
Standard STI tests do not always include the throat. A urine test checks for genital chlamydia and gonorrhea but will miss an infection that only sits in the throat. If you give oral sex, ask the clinic for a throat swab, which takes a few seconds. Blood tests check for syphilis and HIV, and a swab of a sore can test for herpes.
Planned Parenthood and the NHS both recommend regular testing if you have new or multiple partners, and testing whenever you notice symptoms. Bacterial infections such as gonorrhea, chlamydia and syphilis are treatable with antibiotics. Herpes and HPV are managed rather than cured, but treatment and vaccines help a great deal.
How to lower your risk
- Use a barrier. A condom for oral sex on a penis and a dental dam for oral sex on a vulva or anus. Flavored condoms are made for this, see our guide to condoms for oral sex.
- Get vaccinated. The HPV vaccine is recommended through age 26 and can be considered by some adults up to 45. Hepatitis A and B vaccines are widely available.
- Test regularly, including a throat swab if you give oral sex.
- Avoid oral sex when either partner has a cold sore, mouth ulcers, bleeding gums or genital symptoms.
- Do not brush or floss right before oral sex, because small cuts in the gums can make infection easier.
- Talk with partners about testing before you start. It is a normal adult conversation.
For an overall picture of how risky oral sex really is, read is oral sex safe.
Talking to a partner about testing
A short, matter of fact question works best: "When were you last tested, and did it include a throat swab?" Share your own status first if it helps. If you are planning your first experience with a new partner, our first time oral sex guide includes how to fit this into the conversation without it feeling clinical. For technique once you are both comfortable, see how to give a BJ and how to give oral to a woman.
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This guide is general education and is not medical advice. For diagnosis or treatment, talk to a doctor or a sexual health clinic.
Read more about oral sex and health
Our health guides cover safety, barriers and testing in plain language.
Questions people ask
Can you get an STD from oral sex?
Yes. Gonorrhea, chlamydia, syphilis, herpes and HPV can spread through oral sex. The risk is generally lower than with vaginal or anal sex, and barriers and testing lower it further.
What are the symptoms of an STD in the throat?
Often there are none. When symptoms appear they can include a lasting sore throat, redness, sores or blisters in the mouth. See a clinic if you notice anything unusual.
Does a regular STI test check the throat?
Not always. Urine tests check genital infections only. Ask for a throat swab if you give oral sex.
Can you get HIV from oral sex?
It is possible but the risk is very low. It rises with mouth sores, bleeding gums or other infections. Condoms and HIV prevention medication lower it further.
Can a cold sore be passed through oral sex?
Yes. Cold sores are usually caused by HSV 1, which can pass to the genitals during oral sex. Avoid oral sex while a cold sore is present.