Hand, foot, and mouth disease is one of the most common — and most dramatic-looking — childhood viral illnesses in the United States. It strikes mostly children under 5, with peak activity in summer and early fall, and produces the unmistakable trio of mouth ulcers, palm and sole rash, and fever. Daycares and preschools see clusters every year. The illness sounds alarming because of its name and appearance, but in healthy children it is almost always self-limited and resolves within 7-10 days. Knowing the typical course, contagious period, and red flags helps parents avoid panic and unnecessary doctor visits.
What Hand, Foot, and Mouth Disease Is
HFMD is a viral illness caused most often by coxsackievirus A16 in the United States, with enterovirus 71 and other enteroviruses sometimes responsible. Coxsackievirus A6 has caused more atypical and severe outbreaks in recent years, with rash extending beyond hands and feet and onto the face, limbs, and diaper area. Per the CDC, HFMD is most common in children under 5, but older children and adults can get it, often with milder symptoms.
Despite the similar name, HFMD is unrelated to “hoof and mouth” disease in livestock. It does not infect pets and people cannot get it from animals.
Symptoms and Timeline
HFMD usually begins with 1-2 days of fever, malaise, sore throat, and decreased appetite. Painful mouth ulcers (herpangina) appear next, often on the back of the throat, soft palate, tongue, and inside the cheeks. The rash typically appears within 1-2 days of fever onset on the palms, soles, and sometimes the buttocks and diaper area. Lesions start as flat red spots and progress to small fluid-filled vesicles that may crust before resolving.
Symptoms typically peak in the first 2-3 days. Fever usually breaks within 3-4 days. Mouth ulcers can persist 5-7 days and are often the most painful and feeding-limiting feature. Skin lesions resolve in 7-10 days. Atypical coxsackie A6 cases can have more extensive rash and post-illness nail shedding (onychomadesis) about 4-6 weeks later, which is alarming but harmless and resolves on its own.
How HFMD Spreads
HFMD spreads through respiratory droplets from coughs and sneezes, contact with fluid from blisters, and contact with stool — enteroviruses replicate in the gut and shed in feces for weeks. The virus can survive on surfaces and toys. Children are most contagious in the first week of illness, but viral shedding from stool can continue for weeks even after symptoms resolve, making strict isolation impractical beyond the symptomatic phase.
This is why daycares and schools generally allow return when fever has resolved and the child is well enough to participate, rather than requiring all lesions to be healed.
Diagnosis
HFMD is diagnosed clinically based on the characteristic combination of mouth ulcers, palm and sole rash, and recent fever. Lab testing is rarely needed and reserved for severe cases or atypical presentations. The differential diagnosis includes herpetic gingivostomatitis (often more severe oral ulcers without palmar/plantar rash), chickenpox (more diffuse lesions, no preferential palm/sole pattern), and bacterial pharyngitis.
Treatment: Supportive Care
There is no antiviral treatment for HFMD. Care focuses on pain control and hydration. Weight-based acetaminophen or ibuprofen (the latter for ages 6 months and older) treats fever and the throat pain that limits eating and drinking. Cool, soft, bland foods like yogurt, smoothies, and ice pops are usually better tolerated than hot or acidic foods. Avoid citrus, tomato sauce, salty snacks, and crusty breads.
Topical anesthetic mouth rinses or “magic mouthwash” are sometimes prescribed for severe oral pain in older children but should not be used in infants and toddlers due to systemic absorption risks. Antibiotics do not help — HFMD is viral. Skin lesions need no specific treatment beyond keeping the skin clean.
Hydration: The Most Important Issue
The single biggest risk in HFMD is dehydration from refusal to drink due to mouth pain. Encourage small sips of cold liquids frequently — ice water, milk, oral rehydration solutions like Pedialyte. Popsicles, ice chips, and slushies are often well tolerated. Cold foods numb the mouth and reduce pain.
Watch for signs of dehydration: fewer than 3-4 wet diapers in 24 hours in young children, no urination for 8+ hours in older children, no tears when crying, sunken fontanelle in infants, dry mouth, and lethargy. Dehydration is the most common reason for ER visits and hospital admissions in HFMD.
Complications
Complications are uncommon but include dehydration requiring IV fluids, fingernail and toenail shedding 4-6 weeks after illness (especially with coxsackie A6, harmless and self-limited), and rarely viral meningitis or encephalitis with enterovirus 71 — more common in Asia than the U.S. Myocarditis is rare but reported. Pregnant women who contract HFMD typically have mild illness with no clear evidence of fetal harm in routine cases, but late pregnancy infection can rarely be transmitted to the newborn.
When to seek emergency care: Call 911 or go to the nearest emergency room if your child shows signs of severe dehydration (lethargy, sunken eyes, no tears, no wet diaper for 8+ hours, very dry mouth), persistent vomiting, severe headache or stiff neck, confusion, seizure, severe chest pain, or difficulty breathing. Any infant under 3 months with fever (rectal temperature ≥100.4°F) needs immediate evaluation regardless of the rash pattern.
School and Daycare Return
Most pediatricians and the CDC recommend keeping children home until they are fever-free for 24 hours without medication and feel well enough to participate. Strict exclusion until all lesions heal is generally not required because the virus continues shedding for weeks afterward. Routine handwashing, surface disinfection, and not sharing utensils or cups remain important during and after the symptomatic phase.
Prevention
There is no FDA-approved HFMD vaccine in the United States as of 2024-2025 (an enterovirus 71 vaccine exists in some Asian countries). Prevention relies on basic hygiene: frequent handwashing with soap and water (especially after diaper changes and bathroom use), routine cleaning of toys and high-touch surfaces, and avoiding close contact with symptomatic individuals. Hand sanitizer is less effective against enteroviruses than soap and water.
When to Call the Pediatrician
Call the office for HFMD with: significantly decreased intake or signs of dehydration, mouth ulcers preventing all drinking, fever lasting more than 3-4 days, neurological symptoms, severe rash, immunocompromised children with HFMD, infants under 6 months, or pregnant women exposed late in pregnancy. Most cases do not need a visit, but reassurance is reasonable to ask for.
Frequently Asked Questions
Can adults get HFMD?
Yes, though most adults have prior immunity. Adult cases are typically milder, but coxsackie A6 outbreaks have caused more severe adult cases in recent years. Hand hygiene reduces transmission within households.
Can my child get HFMD more than once?
Yes. Multiple enteroviruses cause HFMD, so immunity to one does not protect against others. Reinfections are typically milder.
Do the rash and mouth sores leave scars?
HFMD rash typically heals without scarring. Nail shedding 4-6 weeks later, when it occurs, also resolves completely with new nail growth. Severe lesions in immunocompromised children may scar but this is uncommon.
How long is my child contagious?
The most contagious period is the first week of symptoms. Stool shedding can continue for weeks, so handwashing remains important well after symptoms resolve. Daycare return is generally based on being fever-free and well enough to participate, not on full lesion healing.
The Bottom Line on Hand, Foot, and Mouth Disease
HFMD looks dramatic but is almost always a benign self-limited viral illness. The main goals are pain control, hydration, and watching for dehydration. Most children are back to themselves within a week to ten days, with no long-term effects beyond possibly some temporary nail changes. Manage HFMD like any other common pediatric viral illness and keep your pediatrician’s number handy if hydration is a struggle. Routine well-child visits remain on track once fever resolves, with no special vaccine or testing needed for HFMD itself.