Throat herpes is an infection caused by the herpes simplex virus (HSV) that affects the throat, esophagus, or both. It’s almost always caused by HSV-1, the same virus responsible for cold sores. In a review of confirmed cases in otherwise healthy patients, 96% were caused by HSV-1 and only 4% by HSV-2. The infection can range from a sore throat during a first outbreak to painful ulcers that make swallowing difficult.
How HSV Reaches the Throat
HSV-1 spreads easily through skin-to-skin contact and saliva. While sexual contact is one route, the virus most often spreads through nonsexual contact, like when someone with a cold sore kisses another person. Once the virus enters the body, it can infect the lining of the mouth, the back of the throat, or travel deeper into the esophagus (the tube connecting your throat to your stomach).
After the initial infection clears, HSV doesn’t leave your body. It goes dormant in nerve cells in your head and can reactivate later, sometimes causing new symptoms. About 44% of herpes esophagitis cases in healthy people occur during the very first HSV infection, meaning the rest happen when the virus reactivates.
The virus has a particular affinity for tissue that’s already irritated or damaged. People with acid reflux, for instance, may have esophageal lining that’s more vulnerable to HSV invasion. Once the virus reaches the esophageal lining, it creates ulcerative lesions.
What It Feels Like
The hallmark symptom is pain when swallowing. This can be sharp enough that eating and drinking become genuinely difficult. Many people also experience difficulty getting food down, a sensation of food getting stuck, or chest pain behind the breastbone. The typical patient profile from clinical literature is a young adult (under 40) who develops sudden swallowing pain, sometimes with heartburn.
Some people have warning signs before the throat symptoms hit: fever, a general sore throat, respiratory symptoms, or visible cold sores around the mouth. But in people with healthy immune systems, it’s actually uncommon to have visible mouth sores at the same time as a deeper throat or esophageal infection. That can make the condition harder to recognize, since there’s no obvious external sign pointing to herpes.
Who Gets It
Throat herpes shows up most often in people with weakened immune systems. This includes people living with HIV, those undergoing organ or bone marrow transplants, people on chemotherapy, and anyone taking medications that suppress immune function. In one study of bone marrow transplant recipients with esophagitis, HSV was among the most commonly identified causes. Among kidney transplant patients at one institution, herpes was found in about 5% of those who had esophagitis biopsied.
That said, it does occur in otherwise healthy people, and these cases aren’t as rare as once thought. Even long-term use of inhaled or nasal corticosteroids (commonly prescribed for asthma and allergies) has been linked to cases, likely because these medications reduce local immune defenses in the throat.
How It’s Diagnosed
Because the symptoms overlap with other infections, a physical exam alone isn’t enough. The gold standard for diagnosis involves a procedure called an upper endoscopy, where a thin, flexible camera is passed down the throat to look at the esophagus directly. Herpes esophagitis has a distinctive appearance: multiple small, shallow ulcers with whitish coating, typically in the middle or lower portion of the esophagus.
Small tissue samples are taken from the edges of these ulcers and examined under a microscope. Special staining techniques can identify the characteristic changes HSV causes in cells. Lab tests, including PCR (a highly sensitive method of detecting viral DNA), can confirm the diagnosis and distinguish herpes from other infections that look similar.
Conditions That Look Similar
Two other infections cause very similar symptoms and tend to affect the same populations. Candida (a fungal infection) causes swallowing pain and often comes with visible white patches in the mouth, though not always. Cytomegalovirus (CMV) also causes severe swallowing pain, but it tends to produce fewer, larger ulcers compared to the many small ulcers typical of herpes. Distinguishing between these three is one of the main reasons endoscopy and biopsy are necessary.
Treatment and Recovery
In people with healthy immune systems, herpes esophagitis is self-limiting. Symptoms typically resolve in about seven days without antiviral medication. Most of these patients recover fully on their own, though antivirals may be prescribed if symptoms are severe or persistent.
For people with compromised immune systems, treatment is essential. A standard course of antiviral medication lasts about 14 days. After completing treatment, patients typically achieve complete symptom relief. The visible damage inside the esophagus, as seen on endoscopy, can take up to two weeks to heal even after symptoms improve.
Possible Complications
Most cases resolve without lasting damage, but serious complications are possible in rare instances. The ulcers can erode deeply enough to perforate the esophagus, creating a hole that allows contents to leak into the chest cavity. This is a medical emergency. As of recent literature reviews, spontaneous esophageal perforation from herpes has been reported only a handful of times, with just two cases in people with otherwise normal immune systems. In one reported case, the perforation actually healed on its own, leaving behind a scar.
Repeated or severe infections can also lead to esophageal narrowing from scar tissue, which may cause long-term swallowing problems. These outcomes are uncommon, especially with prompt treatment, but they underscore why persistent or severe swallowing pain deserves medical evaluation rather than a wait-and-see approach.
Can It Come Back?
Because HSV never fully leaves the body, recurrence is possible. The virus stays dormant in nerve cells and can reactivate during periods of stress, illness, or immune suppression. For people with ongoing immune problems, preventive antiviral therapy may be recommended to reduce the risk of repeat episodes. For otherwise healthy individuals, recurrences of esophageal herpes are uncommon, though cold sore outbreaks around the mouth may continue periodically.