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 about 7-10 days. Knowing the typical course, contagious period, and red flags helps parents avoid panic and unnecessary doctor visits. This article is general education, not medical advice — when in doubt about a child, call your pediatrician.
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 the hands and feet onto the face, limbs, and diaper area. Per the CDC, HFMD is most common in infants and children younger than 5, but older children and adults can get it too, often with milder symptoms.
Despite the similar name, HFMD is unrelated to “hoof and mouth” (foot-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 blisters 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 generally resolve in about 7-10 days. Atypical coxsackievirus 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, which makes 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 fully 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 is reserved for severe cases or atypical presentations. The differential diagnosis includes herpetic gingivostomatitis (often more severe oral ulcers without a palm/sole rash), chickenpox (more diffuse lesions, no preferential palm/sole pattern), and bacterial pharyngitis. A telehealth visit can often help parents decide whether an in-person exam is needed; see our telehealth guide.
Treatment: Supportive Care
There is no antiviral treatment for HFMD. Care focuses on pain control and hydration. Weight-based acetaminophen or ibuprofen (ibuprofen for infants 6 months and older) can treat fever and the throat pain that limits eating and drinking — always follow the product label or your pediatrician’s directions for dosing. Never give aspirin to children because of the risk of Reye syndrome. 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 while the mouth is sore.
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 because of the risk of systemic absorption and side effects. Antibiotics do not help — HFMD is viral. Skin lesions need no specific treatment beyond keeping the skin clean; try to keep children from scratching open blisters.
Hydration: The Most Important Issue
The single biggest risk in HFMD is dehydration from refusal to drink because of mouth pain. Encourage small, frequent sips of cold liquids — ice water, milk, or oral rehydration solutions like Pedialyte. Popsicles, ice chips, and slushies are often well tolerated because cold numbs the mouth and reduces pain. Timing a dose of pain reliever about 30 minutes before meals or drinks can also make it easier for a child to take in fluids.
Watch for signs of dehydration: fewer than 3-4 wet diapers in 24 hours in young children, no urination for 8 or more hours in older children, no tears when crying, a sunken soft spot (fontanelle) in infants, dry mouth, and unusual sleepiness or 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 coxsackievirus A6, harmless and self-limited), and, rarely, viral meningitis or encephalitis with enterovirus 71 — more common in parts of Asia than in the U.S. Myocarditis is rare but has been reported. Pregnant people who contract HFMD typically have mild illness with no clear evidence of fetal harm in routine cases, but infection close to delivery can rarely be passed to the newborn, so late-pregnancy exposure is worth mentioning to your clinician.
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 or more hours, very dry mouth), persistent vomiting, severe headache or stiff neck, confusion, seizure, severe chest pain, or difficulty breathing. Any infant under about 3 months with a fever (rectal temperature 100.4°F/38°C or higher) 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 fever-reducing 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. Check your specific daycare’s or school’s policy, which may be stricter than the general guidance.
Prevention
There is no FDA-approved HFMD vaccine in the United States (an enterovirus 71 vaccine exists in some Asian countries but does not cover the other viruses that cause HFMD). Prevention relies on basic hygiene: frequent handwashing with soap and water — especially after diaper changes and bathroom use and before eating — routine cleaning and disinfecting of toys and high-touch surfaces, and avoiding close contact with symptomatic individuals. Hand sanitizer is less effective against enteroviruses than soap and water, so washing hands is preferred whenever possible.
When to Call the Pediatrician
Call the office for HFMD with any of the following: significantly decreased fluid intake or signs of dehydration, mouth ulcers preventing all drinking, fever lasting more than 3-4 days or a fever that returns after improving, neurological symptoms, an unusually severe or spreading rash, an immunocompromised child with HFMD, infants under 6 months, or a pregnant person exposed late in pregnancy. Most cases do not need a visit, but it is always reasonable to call for reassurance.
Frequently Asked Questions
Can adults get HFMD?
Yes, though many adults have prior immunity. Adult cases are typically milder, but coxsackievirus 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 the 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.
Is hand, foot, and mouth disease the same as herpangina?
They are related. Herpangina is the painful mouth-and-throat blistering caused by the same family of enteroviruses; HFMD adds the characteristic rash on the hands and feet. Both are managed with supportive care.
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, keep your pediatrician’s number handy if hydration is a struggle, and lean on your everyday wellness habits like good handwashing to limit spread. Routine well-child visits stay on track once fever resolves, with no special vaccine or testing needed for HFMD itself.
This article is general education, not medical advice, and is not a substitute for care from a qualified clinician. Dose all medicines by the product label or your pediatrician’s instructions, and never give aspirin to a child. Seek prompt care for signs of dehydration, a stiff neck or severe headache, trouble breathing, confusion or seizure, or any fever in an infant under about 3 months (rectal temperature 100.4°F/38°C or higher). For a life-threatening emergency, call 911.
Sources
- Centers for Disease Control and Prevention – “About Hand, Foot, and Mouth Disease” (cdc.gov/hand-foot-mouth)
- American Academy of Pediatrics – HealthyChildren.org, hand-foot-and-mouth disease (healthychildren.org)
- MedlinePlus / U.S. National Library of Medicine – hand, foot, and mouth disease (medlineplus.gov)