Hand, foot, and mouth disease (HFM) has no cure or antiviral treatment. It’s a viral infection that runs its course in 7 to 10 days, so treatment focuses entirely on managing pain, keeping up with fluids, and watching for complications. Most cases resolve on their own without medical intervention.
HFM spreads through several strains of enterovirus, and patients are most contagious during the first week of illness. The incubation period is 3 to 6 days, meaning symptoms appear a few days after exposure. Knowing what to do once those painful blisters and fevers show up can make a real difference in comfort, especially for young children.
Managing Pain and Fever
Over-the-counter pain relievers are the main tool for treating the fever and general achiness that come with HFM. Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) both work well. For children, doses are based on weight: acetaminophen runs 8 to 15 mg per kilogram of body weight, and ibuprofen runs 5 to 10 mg per kilogram. Check the packaging for your child’s weight range if you’re unsure.
Never give aspirin to children or teenagers with a viral illness. Aspirin is linked to Reye’s syndrome, a rare but serious condition that can cause liver and brain damage in young people.
Soothing Mouth Sores
The mouth blisters are often the worst part of HFM, especially for toddlers. They can make eating and drinking painful enough that children start refusing both. A few approaches help take the edge off.
Cold foods and drinks work surprisingly well. Popsicles, ice chips, ice cream, and sherbet all numb the sores temporarily and provide fluid at the same time. Cold water and warm tea (not hot) are also soothing. Avoid anything acidic: citrus fruits, fruit juice, soda, and tomato-based foods will sting open sores. Stick to soft foods that don’t require much chewing.
Topical oral anesthetics, available as gels or throat sprays, can also help numb sore spots. However, don’t give lozenges to children under 4 because of choking risk. Throat sprays containing benzocaine should not be used on children under 2, as benzocaine can cause a dangerous blood condition in very young children.
A simple home remedy used at children’s hospitals is sometimes called “magic mouthwash.” You mix equal parts liquid diphenhydramine (Benadryl) and an antacid like Maalox, then lightly coat the mouth sores with the mixture. This can provide temporary relief for older children who can swish and spit.
Preventing Dehydration
Dehydration is the most common complication of HFM, and it happens because mouth pain makes children stop drinking. This is the single most important thing to stay on top of during the illness.
Offer small, frequent sips of water, milk, or an oral rehydration solution throughout the day rather than waiting for your child to ask. Cold fluids tend to go down easier than room-temperature ones. If your child won’t drink from a cup, try a syringe to get small amounts of fluid in regularly.
Signs of mild dehydration include decreased urine output, which you’ll notice as fewer wet diapers in babies or less frequent bathroom trips in older kids. As dehydration progresses, you’ll see a dry mouth, darker urine, irritability, and skin that doesn’t bounce back quickly when gently pinched. If your child hasn’t had a wet diaper in 6 to 8 hours, seems unusually drowsy or irritable, or has no tears when crying, seek medical attention.
How Long HFM Lasts
Fever typically breaks within 2 to 3 days. The mouth sores are usually the first to appear and the most painful during the first few days, then gradually heal over a week. The rash on the hands, feet, and sometimes buttocks or legs can linger a bit longer but is generally less bothersome than the oral blisters.
One oddity that catches parents off guard: some children lose a fingernail or toenail about 4 to 6 weeks after the illness. This is a known late complication and looks alarming but is harmless. The nails grow back on their own without treatment.
When Kids Can Return to Daycare
The CDC says children can go back to daycare or school as long as they have no fever, feel well enough to participate, and aren’t drooling uncontrollably from mouth sores. You don’t need to wait for every blister to disappear. The virus can still shed in stool for weeks after symptoms resolve, so good handwashing (especially after diaper changes) remains important even after your child feels better.
HFM in Adults
Adults absolutely can get HFM, and it’s not just a childhood illness. The clinical course in adults can actually be more severe than in children. Adults may experience more intense pain, higher fevers, and a rash that looks different from the classic childhood presentation. In adults, sores sometimes start in the mouth and around the lips before spreading to the hands and feet, which is the opposite of the typical pattern in kids. This can lead to confusion with other conditions like herpes or allergic reactions.
Treatment for adults is the same: pain relievers, cold foods for mouth sores, and staying hydrated. Adults generally recover within the same 7 to 10 day window, though the discomfort can feel more intense. Working from home during the first week, when you’re most contagious, helps avoid spreading the virus to others.
Reducing Spread at Home
If one family member has HFM, the virus is likely already circulating in your household, but you can still reduce transmission. Wash hands thoroughly after changing diapers, wiping noses, or touching blisters. Clean shared surfaces like doorknobs, toys, and changing tables with a disinfectant. Avoid sharing cups, utensils, and towels. The virus spreads through saliva, blister fluid, nasal secretions, and stool, so anywhere those fluids land is a potential source of infection.
There is no vaccine for HFM. Repeated infections are possible because multiple viral strains cause the illness, and immunity to one strain doesn’t protect against the others.