Hand, foot, and mouth disease (HFMD) is a common viral illness that causes fever, painful mouth sores, and a skin rash on the hands and feet. It primarily affects children under 5, though anyone can catch it. The illness is usually mild and resolves on its own within 7 to 10 days, but the mouth sores can make eating and drinking uncomfortable, especially for young children.
What Causes It
HFMD is caused by a group of viruses called enteroviruses. The most common culprit is coxsackievirus A16, though other strains can also trigger the illness. It spreads easily in childcare settings and schools because young children are constantly touching surfaces, putting things in their mouths, and sharing close contact with each other. Their immune systems also haven’t built up defenses against these viruses yet.
How It Spreads
The virus lives in saliva, nasal mucus, blister fluid, and stool. Your child can pick it up by touching a contaminated surface, being close to someone who coughs or sneezes, or coming into contact with the fluid from another child’s blisters. Diaper changes are another common route, since the virus sheds in stool.
People with HFMD are most contagious during the first week of illness. But the virus can continue spreading for days or even weeks after symptoms disappear. Some people spread it without ever showing symptoms at all, which is one reason outbreaks move so quickly through daycare centers.
Symptoms and Timeline
After exposure, there’s an incubation period before symptoms appear. Research estimates a median incubation of about 5 days, though it can range from 3 to 7 days in most cases and occasionally stretch beyond 10.
The illness typically unfolds in stages:
- Fever and flu-like symptoms usually come first, appearing 3 to 5 days after catching the virus. Your child may seem tired, irritable, and have a sore throat.
- Mouth sores develop next, starting as small red spots on the tongue and inside the cheeks. These quickly become painful ulcers that can make eating and drinking difficult.
- Skin rash follows on the palms of the hands and soles of the feet. It can also appear on the buttocks, legs, and arms. The rash may look like flat red spots or small blisters, and it’s not always itchy.
Not every child gets all three symptoms. Some develop only mouth sores, others only the rash. A few have such mild cases they never seem sick at all.
How It Differs From Similar Illnesses
HFMD is sometimes confused with two other childhood illnesses. Herpangina is caused by similar viruses but produces ulcers only at the back of the mouth, without the hand and foot rash. Chickenpox causes blisters that spread across the entire body, typically starting on the trunk, and the blisters have a distinctive “dewdrop on a rose petal” appearance that looks different from the flat spots and small blisters of HFMD. If you’re unsure which illness your child has, the location of the rash is the biggest clue: blisters concentrated on the hands, feet, and inside the mouth point strongly toward HFMD.
Managing Symptoms at Home
There’s no antiviral treatment for HFMD. The illness runs its course, and care focuses on keeping your child comfortable and hydrated. Mouth sores are usually the hardest part, since they can make children refuse food and drinks.
For pain and fever, acetaminophen or ibuprofen can help. Do not give aspirin to children, as it’s linked to a rare but serious condition called Reye’s syndrome. For mouth pain specifically, a topical oral anesthetic can numb the sores temporarily. Avoid benzocaine-containing products for children under 2, and don’t give lozenges to children under 4 due to choking risk.
Cold foods and drinks are your best tools for getting fluids in. Ice pops, ice chips, sherbet, and cold water all soothe sore mouths. Warm tea can also help. Avoid anything acidic like citrus juice, fruit drinks, or soda, as these will sting the sores. Stick to soft foods that don’t require much chewing. If your child is old enough to rinse without swallowing, warm salt water swished several times a day can ease pain and swelling.
When Children Can Return to School
Most childcare centers and schools follow CDC-aligned policies for return. Generally, your child can go back once they’ve been fever-free for at least 24 hours without using fever-reducing medicine, any open skin sores are crusting over, and they’re feeling well enough to participate. Keep in mind that even after symptoms resolve, the virus still sheds in stool for weeks, so good hand hygiene after bathroom visits and diaper changes remains important.
Rare but Serious Complications
The vast majority of HFMD cases resolve without problems. Dehydration is the most common concern, simply because children with painful mouth sores stop drinking enough.
In rare cases, certain viral strains can cause more serious complications. These include viral meningitis (inflammation around the brain and spinal cord), brain stem inflammation, and in very rare instances, problems with heart and lung function. A systematic review of severe cases found that neurological complications, while uncommon, could include limb weakness, difficulty swallowing, and problems with coordination. These outcomes are heavily associated with specific strains and are not typical of the common form of the disease.
Some children also experience temporary nail loss weeks after recovering from HFMD. The fingernails or toenails may peel or fall off, which looks alarming but is harmless. The nails grow back normally.
Prevention Tips
There’s no vaccine widely available for HFMD. Prevention comes down to basic hygiene: frequent handwashing with soap and water (especially after diaper changes and bathroom use), disinfecting shared surfaces and toys, and avoiding close contact with infected individuals. Teaching young children not to share cups, utensils, or pacifiers also helps, though anyone who’s tried to enforce this in a toddler playgroup knows the limits of that strategy. During outbreaks, keeping a sick child home during that first week of illness, when they’re most contagious, is the single most effective step you can take.