Herpes of the Throat: Symptoms, Causes, and Treatment

Herpes of the throat — herpes pharyngitis — is an underrecognized condition that presents like many other throat infections. HSV-1 is the most common cause of herpes pharyngitis, acquired through oral sex or primary oral HSV-1 infection; it causes severe sore throat with ulcers at the back of the throat that are clinically indistinguishable from other pharyngitis without testing; and HSV-2 pharyngitis from oral sex is less common but documented.

How Herpes Reaches the Throat

Primary oral HSV-1 infection: when HSV-1 infects the mouth for the first time, the pharynx is frequently involved as part of the primary herpetic gingivostomatitis — diffuse oral and pharyngeal ulceration with fever and lymphadenopathy. Oral sex: receiving oral sex from a partner with genital herpes (HSV-2), or giving oral sex to a partner with oral HSV-1, can infect the pharynx. HSV-2 pharyngitis is specifically associated with receiving oral sex from an infected partner. Reactivation: HSV-1 latent in the trigeminal ganglion can reactivate to produce pharyngeal rather than labial lesions in some individuals.

Symptoms

Herpes pharyngitis produces: severe sore throat, often more painful than typical viral or streptococcal pharyngitis; vesicles and ulcers at the posterior pharynx, soft palate, and tonsils; fever (often 38-40°C); swollen cervical lymph nodes; difficulty swallowing (odynophagia); and sometimes concurrent oral lesions (lips, gums, tongue). The pharyngeal ulcers are grey-white, shallow, and painful. In isolation, without oral herpes lesions, herpes pharyngitis is clinically indistinguishable from streptococcal pharyngitis or infectious mononucleosis. A throat strep swab coming back negative doesn't point to herpes — a specific herpes PCR swab from the pharynx is needed.

Herpes Pharyngitis vs Strep Throat

Both cause severe sore throat with pharyngeal exudate or ulcers. Clinical clues favouring herpes: recent oral sex with a new partner; concurrent vesicles on lips or gums; negative rapid strep test; pharyngeal ulcers rather than just exudate; history of previous herpes diagnosis. Neither can be reliably distinguished without testing. If you have a severe sore throat after oral sex, mention this to your provider — it should prompt a throat PCR for herpes.

Treatment

Primary herpetic pharyngitis: oral valacyclovir 1g twice daily or acyclovir 400mg five times daily for 7 to 10 days. The course is longer than for recurrent labial herpes because primary infection is more extensive. Supportive care: adequate hydration (hospitalization if dehydration develops), analgesics, topical anaesthetic rinses. Recurrent herpes pharyngitis: valacyclovir 500mg twice daily for 3 to 5 days.

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Frequently Asked Questions

Can you get herpes in your throat from giving oral sex?

Yes. Performing oral sex on a partner with genital herpes (HSV-2) can infect the throat with HSV-2. Performing oral sex on a partner with oral HSV-1 can also expose the throat to HSV-1 through oral secretions.

How do I know if my sore throat is herpes?

You can't reliably distinguish herpes pharyngitis from strep throat or mononucleosis by symptoms alone. A throat PCR swab during the active infection is the definitive test. Tell your provider if you've had recent oral sex — this should trigger herpes throat testing.

Is herpes in the throat serious?

In immunocompetent adults, herpes pharyngitis resolves with antiviral treatment. It can cause significant discomfort and difficulty eating. In immunocompromised patients (HIV with low CD4, transplant recipients), herpes pharyngitis can be more extensive and require IV antiviral therapy.

Related: STD with sore throat · Oral gonorrhea symptoms · Herpes on the tongue · Get tested today

This article is for informational purposes only and does not constitute medical advice.