Teach me about HFMD

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"hand foot and mouth disease"

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CDC hand foot and mouth disease symptoms prevention when to seek care

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hand foot mouth disease child typical vesicular rash hands feet mouth clinical photograph

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https://www.cdc.gov/hand-foot-mouth/about/index.html

Hand, foot, and mouth disease (HFMD)

HFMD is a common, contagious viral illness, mainly in children under 5, though older children and adults can get it too. It is not related to foot-and-mouth disease in animals.

It is usually caused by enteroviruses, especially coxsackievirus A16, coxsackievirus A6, and enterovirus A71. Goldman-Cecil Medicine, p. 3632.

Typical symptoms

Symptoms often begin 3 to 5 days after exposure:

Fever, tiredness, poor appetite, sore throat
Painful mouth sores: red spots that become small blisters or ulcers, commonly on the tongue, gums, inner cheeks, or roof of the mouth
Rash: flat or slightly raised red spots, sometimes blistering, on the palms and soles. It may also occur on the buttocks, legs, arms, or around the mouth.

The mouth pain is often the hardest part because it can make drinking painful. HFMD commonly resolves on its own in 7 to 10 days. The CDC HFMD overview and Goldman-Cecil Medicine, p. 3632, describe this usually self-limited course.

How it spreads

HFMD spreads easily through contact with:

Saliva, nasal secretions, or respiratory droplets
Fluid from blisters
Stool, especially during diaper changes
Contaminated hands, toys, surfaces, cups, and utensils

People are often most contagious in the first week, but virus can remain in stool for weeks afterward. Good handwashing remains useful even after the rash has gone.

Treatment

There is no specific antiviral treatment for routine HFMD. Care is supportive:

Encourage frequent fluids. Cold water, ice pops, or other non-acidic cool fluids may be easier to tolerate.
Use age-appropriate pain or fever medicine such as acetaminophen or ibuprofen if suitable for the person.
Avoid aspirin in children or teenagers because of the risk of Reye syndrome.
Offer soft foods and avoid acidic, salty, spicy, or very hot foods that sting mouth ulcers.
Keep blistered areas clean and avoid deliberately popping blisters.

The priority is preventing dehydration. The CDC symptom guidance specifically highlights painful swallowing and inadequate fluid intake as the main practical concern.

When to seek medical care

Contact a clinician promptly if the child or adult:

Is drinking poorly or has signs of dehydration: very little urine, dry mouth, no tears when crying, marked sleepiness, or dizziness
Has fever lasting more than 3 days, a very high fever, or appears significantly unwell
Has severe headache, stiff neck, confusion, unusual drowsiness, weakness, or trouble walking
Is an infant younger than 6 months, immunocompromised, or pregnant with a meaningful exposure
Has symptoms that are not improving after about 7 to 10 days

Serious complications such as viral meningitis, encephalitis, or paralysis are very rare, although enterovirus A71 has been associated with more severe neurologic disease in a small proportion of cases. Red Book 2021, enterovirus infections section.

Preventing spread

Wash hands with soap and water, especially after toileting, diaper changes, wiping noses, and before meals.
Clean frequently touched surfaces and toys.
Do not share cups, utensils, towels, or pacifiers.
Keep a child home if they have a fever, feel too unwell to participate, or have uncontrolled drooling from painful mouth sores. Follow the childcare or school’s local policy.

Atypical HFMD

Not every case fits the classic hand-and-foot pattern. Coxsackievirus A6 can cause a more widespread rash, larger blisters, facial lesions, or later temporary nail shedding. A recent systematic review documents these atypical skin findings: PMID 37877202.

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