Hand, Foot and Mouth Disease: Symptoms, Treatment, and Contagion

Few things send a parent scrolling through WebMD faster than a sudden fever and a rash that wasn’t there yesterday. If your child has a sore throat, spots in the mouth, and blisters on their hands or feet, it’s likely hand, foot and mouth disease (HFMD) — a common viral illness that usually clears up on its own in about a week.

Common childhood illness: Affects mainly children under 5 ·
Incubation period: 3 to 6 days ·
Duration: Usually 7 to 10 days ·
Adults affected: Yes, but most are immune

The pattern: HFMD hits fast, then fades. Most children recover without needing a doctor visit.

What is hand, foot and mouth disease?

Cause

• HFMD is caused by coxsackievirus A16 and enterovirus 71, both members of the enterovirus family (CDC).
• The virus spreads through respiratory droplets, saliva, fluid from blisters, and contaminated surfaces (CDC).

Who is at risk

• Children under 5 are the most common group, but older kids and adults can also get it (PMC/NIH).
• Adults who are not immune (most are) may catch it from their own children (Cleveland Clinic).

The implication: HFMD is a classic childhood infection that parents can’t ignore, but it rarely causes serious trouble.

What are the first signs of hand, foot, and mouth?

In children

• Symptoms often start with fever, sore throat, and runny nose 3 to 5 days after exposure (CDC).
• Painful mouth sores (ulcers) appear in the back of the throat, then a red rash on the palms, soles, and sometimes the buttocks (Children’s Hospital of Philadelphia).

In adults

• Adults may have no symptoms at all, but when they do, the pattern is similar: fever, sore throat, and painful mouth lesions (Cleveland Clinic).
• Some adults report a more severe rash and higher fever than children (PMC/NIH).

The trade-off: Adults who get HFMD tend to feel worse, but the illness still resolves on its own within a week.

What does HFM look like in adults?

Rash patterns

• The rash in adults can be more widespread and more painful, often involving the hands, feet, and sometimes the trunk (PMC/NIH).
• Blisters may be larger and more numerous than in children (Mayo Clinic).

Pain levels

• Mouth sores in adults can make eating and drinking very painful, increasing the risk of dehydration (CDC).
• Fever in adults tends to be higher, sometimes reaching 103°F (39°C) (CDC).

Why this matters: If you’re an adult with a fever and a blistery rash, don’t assume it’s just a cold — HFMD is a real possibility, and it’s highly contagious.

How do you treat hand, foot and mouth disease?

Home care

• There is no specific antiviral treatment; care focuses on relieving symptoms (Mayo Clinic).
• Use over-the-counter pain relievers like acetaminophen or ibuprofen to reduce fever and mouth pain. Do not give aspirin to children (CDC).
• Offer soft, cold foods (yogurt, smoothies, ice cream) to help with swallowing (Children’s Hospital of Philadelphia).
• Encourage fluids to prevent dehydration. Avoid acidic or spicy foods that irritate mouth sores (Cleveland Clinic).

When to see a doctor

• If your child cannot swallow any fluids, has a fever over 103°F, or seems very lethargic, contact your pediatrician (CDC).
• Adults with severe symptoms or signs of dehydration should also seek medical advice (Mayo Clinic).

How long is hand foot mouth contagious?

Contagious period

• HFMD is most contagious during the first week of illness (HealthyChildren.org).
• The virus can be spread starting the day before the rash appears and for several days afterward (Children’s Hospital of Philadelphia).

Return to school/work

• Children can return to daycare or school once the fever is gone and mouth sores have healed — usually about 7 days after symptom onset (CDC).
• Adults should stay home from work until they are no longer contagious, typically 5–7 days (WebMD).

The pattern: The contagious window is short, but it starts before you know you’re sick — which is why outbreaks spread so fast in close-contact settings.

What gets mistaken for hand, foot, and mouth?

Other viral rashes

• Herpangina — caused by the same coxsackie virus — produces mouth ulcers but no hand/foot rash (CDC).
• Chickenpox causes a blistery rash that can look similar, but chickenpox rash is more widespread and intensely itchy (Mayo Clinic).

Allergic reactions

• Contact dermatitis or allergic reactions to medications can produce red spots, but they lack the mouth sores and fever typical of HFMD (HealthyChildren.org).

The trade-off: When in doubt, look for the combination of fever + mouth sores + rash on palms and soles — that’s the HFMD signature.

Expert perspectives on HFMD

Most children with HFMD get better on their own in 7 to 10 days. The key is to keep them comfortable and hydrated.

— CDC (U.S. public health authority)

There is no specific treatment for HFMD. Antibiotics won’t work because it’s a virus.

— Mayo Clinic (leading medical center)

HFMD is very contagious and spreads quickly in schools and day care centers. Good hand hygiene is the best prevention.

— Cleveland Clinic (academic medical center)

For parents of young children, the decision is clear: recognize the symptoms early, isolate the sick child, and focus on hydration and pain relief. For adults, the same rules apply — but don’t be surprised if the rash hurts more than you expected. The virus will run its course in about a week, and your job is to make that week as bearable as possible.

Frequently asked questions