Hand, foot, and mouth disease typically starts with a fever and sore throat, followed one to two days later by painful mouth sores and a skin rash on the hands and feet. Symptoms usually appear 3 to 6 days after exposure to the virus and resolve on their own within 7 to 10 days. While it mostly affects children under five, adults can get it too.
Early Symptoms Before the Rash
The first signs look a lot like any common childhood illness. Your child may develop a fever, feel generally unwell, and start eating or drinking less than usual. A sore throat often appears around the same time. These flu-like symptoms typically show up 3 to 5 days after catching the virus, and at this early stage there’s nothing visually distinctive to tip you off that it’s hand, foot, and mouth disease rather than a regular cold.
This matters because your child is most contagious during these first few days of illness, often before the telltale rash appears. By the time you recognize what you’re dealing with, they may have already spread the virus to siblings, classmates, or caregivers.
Mouth Sores
One to two days after the fever starts, painful sores develop inside the mouth. They begin as small red spots, often on the tongue and the insides of the cheeks, then progress into blister-like lesions. They can also form toward the front of the throat. These sores are the reason many children stop eating and drinking. They’re genuinely painful, especially with acidic or salty foods, and younger kids who can’t explain what hurts may simply refuse to eat or become unusually fussy.
Keeping your child hydrated is the main concern during this stage. Cold fluids and soft, bland foods are generally easier to tolerate than anything with citrus, spice, or rough texture.
The Rash on Hands, Feet, and Beyond
The skin rash appears around the same time as the mouth sores or shortly after. It shows up as small red spots that can develop into blisters. The classic locations are the palms of the hands and the soles of the feet, which is where the disease gets its name. But the rash can also appear on the buttocks, legs, and arms.
The rash itself isn’t always itchy the way chickenpox is. Some children barely notice it, while others find the blisters on their feet uncomfortable when walking. The spots on the palms and soles tend to be flat or slightly raised and may look red or grayish depending on skin tone.
Atypical Rash Patterns
Not every case follows the textbook pattern. A particular strain of the virus, coxsackievirus A6, causes a more widespread rash that can cover the arms, legs, trunk, buttocks, genitalia, and the skin around the mouth. This version can look strikingly similar to chickenpox, with a scattered, blister-heavy rash that extends well beyond the hands and feet. Cases like these are sometimes misdiagnosed because they don’t match the classic description parents and even some providers expect.
If your child’s rash looks more like chickenpox but they haven’t had a high fever for over a week (chickenpox has a much longer incubation period of 10 to 21 days), hand, foot, and mouth disease is still a strong possibility.
How It Differs From Chickenpox
The two diseases are easy to confuse, but a few differences help tell them apart. Chickenpox rash starts on the torso and spreads outward to the head, arms, and legs over 7 to 10 days. Hand, foot, and mouth rash concentrates on the mouth, hands, and feet. Chickenpox blisters also go through a predictable cycle: red bumps that look like bug bites, then fluid-filled blisters, then pus-filled blisters, then scabs. You’ll often see all four stages on the skin at once as new waves of lesions appear. Hand, foot, and mouth blisters tend to be more uniform in appearance and don’t typically scab over the same way.
The timeline is another clue. Hand, foot, and mouth disease develops within 3 to 6 days of exposure, while chickenpox takes 10 to 21 days to show up after contact.
How Long Symptoms Last
Most children recover within 7 to 10 days without any specific treatment. The fever usually breaks first, often within a couple of days. The mouth sores and rash linger longer but gradually fade. Children under two may take a bit longer to fully clear the virus.
There is no antiviral treatment for hand, foot, and mouth disease. Management focuses on comfort: pain relief for the mouth sores, staying hydrated, and rest. The illness runs its course on its own.
Nail Changes After Recovery
One symptom catches many parents off guard because it shows up weeks after the illness seems over. Some children lose one or more fingernails or toenails roughly a month after their symptoms resolve. The nail may loosen, peel, or simply fall off. This is a known aftereffect of the virus, particularly with the A6 strain. It looks alarming, but the nails grow back normally. No treatment is needed beyond keeping the nail bed clean.
Symptoms in Adults
Adults can catch hand, foot, and mouth disease, though it’s less common because most people build some immunity through childhood exposure. When adults do get it, they experience the same core symptoms: fever, mouth sores, and rash on the hands and feet. Some adults have very mild cases with minimal rash, while others develop significant mouth pain and widespread blisters. Adults who were exposed to a child with the disease and develop a rash within the following month should consider hand, foot, and mouth as a likely cause, even if it feels like an unusual diagnosis for their age.
Signs of Dehydration to Watch For
The most common complication isn’t from the virus itself but from children not drinking enough because of the mouth pain. Signs your child may be getting dehydrated include fewer wet diapers than usual, crying without tears, a dry mouth, and unusual sleepiness or irritability. In rare cases, the virus can lead to more serious complications like viral meningitis or inflammation of the brain, but these are uncommon. A child who develops a very high fever that won’t come down, seems confused, has a stiff neck, or becomes difficult to wake warrants immediate medical attention.