Herpangina is a common viral infection that causes small, painful ulcers in the back of a toddler’s throat and mouth. It’s caused by enteroviruses, most often coxsackievirus B, and typically resolves on its own within 7 to 10 days. Despite the name, it has nothing to do with the herpes virus.
What Causes Herpangina
At least 22 different enterovirus strains can cause herpangina, but the most common culprits are coxsackievirus B, coxsackievirus A16, and enterovirus 71. These viruses circulate widely in summer and early fall, spreading through saliva, nasal secretions, and contact with stool (a major factor in diaper-age children). Toddlers in daycare or group settings pick it up easily because the virus can live on surfaces like toys, doorknobs, and changing tables.
A child sheds the virus from the upper respiratory tract for 1 to 3 weeks after infection and in their stool for up to 12 weeks. Asymptomatic shedding is common too, meaning children who look perfectly healthy can still pass the virus along. This is why outbreaks tend to roll through daycare classrooms.
What Herpangina Looks and Feels Like
The hallmark of herpangina is small ulcers clustered in the back of the mouth: on the soft palate, the back of the throat near the tonsils, and sometimes the uvula. These sores start as tiny red spots, blister briefly, then open into shallow, grayish-white ulcers with red borders. They’re usually 1 to 4 millimeters across.
Most toddlers develop a sudden fever, often high (up to 104°F or more), a day or two before the sores appear. Once the ulcers arrive, the fever usually drops, but the throat pain ramps up. Your toddler may refuse food and drinks, drool more than usual, or seem generally miserable. Some children also have a headache, stomachache, or vomiting early on. The sores themselves typically heal within 5 to 7 days without scarring.
Herpangina vs. Hand, Foot, and Mouth Disease
Parents often confuse herpangina with hand, foot, and mouth disease (HFMD) because both are caused by enteroviruses and both produce mouth sores. The key difference is location and spread. Herpangina produces ulcers only in the back of the mouth: the soft palate, throat, and tonsillar area. HFMD puts sores on the tongue and inside of the cheeks, plus a characteristic rash with small blisters on the hands, feet, and sometimes the buttocks.
If your toddler has painful throat sores but no rash on the hands or feet, herpangina is the more likely culprit. Both infections are self-limiting and managed the same way at home.
Keeping Your Toddler Comfortable
There’s no antiviral treatment for herpangina. The virus runs its course, and the goal is to manage pain and prevent dehydration while it does. Acetaminophen or ibuprofen can help with both fever and throat pain. Topical numbing gels designed for the mouth can also provide short-term relief before meals.
The biggest practical challenge is getting your toddler to drink enough. Painful swallowing makes many toddlers refuse liquids right when they need them most. Cold or room-temperature fluids tend to go down easier than warm ones. Ice pops, chilled applesauce, yogurt, and smoothies can help because the cold soothes the sores while delivering fluid and calories. Avoid anything acidic (orange juice, tomato sauce), salty, or spicy, as these will sting the open ulcers.
Watch for signs of dehydration: fewer wet diapers than usual, no tears when crying, a dry mouth, or unusual sleepiness. Dehydration from inadequate fluid intake is the most common complication of herpangina in toddlers, and it’s the main reason some children end up needing medical attention.
Rare but Serious Complications
The vast majority of herpangina cases resolve without any lasting problems. However, one strain, enterovirus 71, is an emerging public health concern because it can cause severe illness beyond the typical mouth sores. In rare cases, enterovirus 71 has been linked to encephalitis (brain inflammation) and encephalomyelitis (inflammation of the brain and spinal cord), particularly in newborns and very young children.
Signs that something more serious may be developing include a stiff neck, persistent high fever that doesn’t respond to fever reducers, extreme lethargy or difficulty waking, repeated vomiting, or any unusual neurological symptoms like jerking movements, trouble walking, or appearing confused. These are uncommon, but they warrant prompt medical evaluation.
How to Reduce the Spread
Because enteroviruses spread through saliva, respiratory droplets, and stool, hand hygiene is the single most effective prevention tool. Wash your hands and your toddler’s hands with soap and water for at least 20 seconds, especially after diaper changes, trips to the bathroom, and nose-blowing. Clean and disinfect shared surfaces and toys regularly, particularly during an active outbreak at daycare.
Keeping a sick child home while they have a fever and active sores helps reduce transmission, but complete isolation isn’t realistic given how long the virus sheds. Stool shedding can continue for up to 12 weeks, and many children spread the virus before symptoms even appear. Good hygiene habits, consistently practiced, are more effective than trying to time a return to daycare around contagiousness alone.