What Is Hand, Foot, and Mouth Disease? Symptoms and Transmission

Hand, foot, and mouth disease is a contagious viral infection that mainly affects children younger than five years of age. It can cause fever, painful mouth sores, and a rash on the hands and feet. The illness usually resolves on its own within 7 to 10 days. However, children who cannot drink because of painful mouth sores may become dehydrated, and serious complications can occur in rare cases.

Antibiotics are not used to treat hand, foot, and mouth disease because it is caused by viruses from the enterovirus family rather than bacteria. Treatment focuses on controlling pain and fever, maintaining adequate fluid intake, and reducing the risk of transmission.

What Is Hand, Foot, and Mouth Disease?

Hand, foot, and mouth disease can be caused by several enteroviruses. Coxsackievirus A16 is one of the most common causes. Coxsackievirus A6 and enterovirus A71 may also cause the disease. Serious neurological complications have been associated more frequently, although still rarely, with some enterovirus A71 infections.

The disease is most common in infants and preschool-aged children, but older children, adolescents, and adults may also become infected. Having the disease once does not provide complete lifelong protection. A person may develop hand, foot, and mouth disease again after being infected with a different enterovirus.

Hand, foot, and mouth disease is not the same as foot-and-mouth disease in animals. The human infection is unrelated to the disease that affects animals such as cattle, sheep, goats, and pigs.

How Does Hand, Foot, and Mouth Disease Begin?

Symptoms usually begin several days after exposure to the virus. Early signs may include fever, sore throat, reduced appetite, tiredness, and irritability. Young children may not be able to describe pain in their mouth or throat. They may refuse food, drool more than usual, or prefer cold drinks.

Painful mouth sores and a skin rash may follow the initial symptoms. Although the illness is named after the hands, feet, and mouth, the rash may also appear on the buttocks, legs, arms, around the knees, or in the diaper area.

Early symptoms may include:

• Fever: This is often one of the first signs and may continue for several days.

• Sore throat: Pain or a burning sensation may occur when swallowing.

• Reduced appetite: Mouth and throat pain may make the child reluctant to eat or drink.

• Tiredness and irritability: Young children may sleep poorly or cry more than usual.

• Increased drooling: Children who avoid swallowing because of mouth sores may drool more.

What Are the Symptoms of Hand, Foot, and Mouth Disease?

The most characteristic signs are fever, painful mouth sores, and a rash on the hands and feet. However, not every person develops all of these symptoms. Some children may have only mouth sores or a mild rash.

The rash commonly appears on the palms and soles. It may begin as flat or slightly raised red spots and sometimes develop into small fluid-filled blisters. The rash is not usually intensely itchy. Because blister fluid may contain the virus, the lesions should be kept clean and should not be picked or opened.

Symptoms in Children

The severity of symptoms may vary according to the child’s age, immune status, and the virus causing the infection. One of the main concerns in young children is reduced fluid intake due to painful mouth sores.

Common symptoms in children include:

• Mouth sores: Red spots, blisters, or painful ulcers may develop on the tongue, gums, palate, and inside the cheeks.

• Rash on the hands and feet: Spots or blisters may appear on the palms, fingers, soles, and toes.

• Fever: It may be mild or moderate. A very high or prolonged fever requires further assessment.

• Difficulty eating and drinking: The child may reduce food and fluid intake because swallowing is painful.

• Drooling: This may be a sign of mouth pain, particularly in children who cannot describe their symptoms.

• Tiredness and irritability: The child may be sleepier, less interested in playing, or more tearful than usual.

• Rash on the buttocks and legs: The rash is not always limited to the hands and feet.

Symptoms in Adults

Adults can also develop hand, foot, and mouth disease. Some adults experience no symptoms or only a mild illness. However, mouth sores, fever, sore throat, and a hand or foot rash can occur.

Possible symptoms in adults include:

• Sore throat and fever

• Burning, tenderness, or sores inside the mouth

• Red spots or blisters on the palms and soles

• Muscle aches, tiredness, and headache

• Pain while eating or drinking

• More widespread or noticeable skin lesions

Mild symptoms do not mean that an adult cannot spread the infection. Parents, caregivers, and teachers should pay particular attention to hand hygiene after changing diapers or coming into contact with a child’s saliva, nasal secretions, or rash.

What Causes Hand, Foot, and Mouth Disease?

Hand, foot, and mouth disease develops when viruses from the enterovirus family enter the body. The virus may enter through the eyes, nose, or mouth. Coxsackievirus A16 is one of the most common causes, but Coxsackievirus A6, enterovirus A71, and other enteroviruses may also cause the illness.

Young children are more vulnerable because they may not have encountered these viruses before and their personal hygiene habits are still developing. The virus can spread more easily in settings involving frequent close contact, including nurseries, preschools, and playgroups.

Developing the disease does not necessarily mean that a child has a weakened immune system. Healthy children may also contract hand, foot, and mouth disease.

How Does Hand, Foot, and Mouth Disease Spread?

Hand, foot, and mouth disease spreads easily from person to person. The virus may be present in an infected person’s saliva, nasal and throat secretions, stool, and blister fluid.

Common routes of transmission include:

• Contact with droplets released during coughing, sneezing, or talking

• Kissing, hugging, or other close contact with an infected person

• Sharing cups, cutlery, towels, or toys

• Touching contaminated tables, door handles, toys, or other surfaces

• Contact with stool during diaper changes or toileting

• Direct contact with fluid from blisters

Touching the eyes, nose, or mouth with contaminated hands makes it easier for the virus to enter the body.

How Long Is Hand, Foot, and Mouth Disease Contagious?

A person may begin spreading the virus a few days before symptoms appear. Transmission is generally more likely during the first days of illness. However, the virus may continue to be passed in stool for several weeks. Careful handwashing remains important after the child appears to have recovered, particularly after toileting or diaper changes.

The fact that the virus may remain in stool for several weeks does not mean that a child must stay away from school or nursery for the entire period. Return should be based on the child’s overall condition, fever, ability to drink, and the institution’s health policies.

Can Adults Catch Hand, Foot, and Mouth Disease?

The disease can spread from children to adults. Symptoms in adults may be mild or absent, but an infected adult may still pass the virus to other people.

Parents, childcare workers, teachers, and healthcare professionals should wash their hands with soap and water after changing diapers, wiping a child’s mouth, or touching skin lesions.

How Is Hand, Foot, and Mouth Disease Diagnosed?

Diagnosis is usually based on the symptoms, the child’s age, and the distribution of the rash. Mouth sores occurring together with a rash on the palms and soles may support the diagnosis.

Not every rash is caused by hand, foot, and mouth disease. Chickenpox, allergic reactions, herpes infections, herpangina, and certain bacterial infections may cause similar symptoms. Medical assessment is particularly important when the rash is widespread, the child is very young, or their general condition is poor.

Laboratory testing is not usually required in mild cases. In atypical or severe cases, or when neurological symptoms are present, specific tests may be performed on throat swabs, stool, blister fluid, or other samples.

Is There a Treatment for Hand, Foot, and Mouth Disease?

There is no standard antiviral treatment that directly eliminates hand, foot, and mouth disease. Antibiotics do not treat the illness because they are not effective against viruses. Most people recover through their own immune response within 7 to 10 days.

Treatment focuses on relieving symptoms and preventing dehydration. Any medicine used for fever or pain must be appropriate for the child’s age and weight. Medicines should not be used without advice from a doctor or pharmacist.

What Should Be Considered During Home Care?

The child should rest and be encouraged to drink small amounts of fluid frequently throughout the day. Drinking a large amount at once may be difficult because of mouth pain.

Supportive measures include:

• Offering cool water, milk, or other age-appropriate fluids in small sips

• Choosing soft foods such as yoghurt, purée, and lukewarm or cool soup

• Avoiding hot, spicy, very salty, and acidic foods

• Keeping blisters clean and dry

• Avoiding popping blisters or peeling the skin

• Separating the child’s towels, cups, and cutlery

• Monitoring urination and the child’s general condition

What Helps Mouth Sores?

Cool fluids and soft foods may help reduce mouth discomfort. Fruit juice, fizzy drinks, citrus fruits, tomatoes, spicy foods, and highly salted foods may irritate the sores.

Mouth ulcer gels, sprays, and mouthwashes are not suitable for every age group. Because of the risk of swallowing and differences between products, they should not be used in young children without advice from a doctor or pharmacist. Children who cannot rinse and spit should not be given a mouthwash.

A child who cannot drink, urinates less than usual, or becomes increasingly tired may be developing dehydration and requires medical assessment.

How Long Does Hand, Foot, and Mouth Disease Last?

Most children recover within 7 to 10 days. Fever and tiredness are usually more noticeable during the first few days. Mouth sores and the rash generally begin to improve afterward.

In some children, complete resolution of the rash or return of the skin to its usual appearance may take slightly longer. A medical evaluation is needed when symptoms do not improve within 7 to 10 days, begin worsening again, or new symptoms appear.

Is Hand, Foot, and Mouth Disease Dangerous?

The illness is usually mild and resolves without causing lasting health problems. The most common concern is dehydration caused by reduced fluid intake due to painful mouth sores.

Viral meningitis, encephalitis, and other neurological complications can occur rarely. The risk may be more pronounced with certain enterovirus A71 infections. The rarity of serious complications does not mean that warning signs should be ignored.

Which Symptoms Require Emergency Assessment?

An online consultation is not sufficient when any of the following symptoms are present, and urgent in-person assessment is required:

• Severe breathing difficulty or bluish discoloration

• Confusion, inability to wake the child, or unusual drowsiness

• Seizure

• Neck stiffness or severe headache

• Difficulty walking, sudden weakness, or loss of balance

• Complete inability to drink

• Significantly reduced urination

• Repeated and uncontrolled vomiting

• Rapidly worsening general condition

A fever in an infant younger than three months, symptoms in an immunocompromised child, or a very high or prolonged fever also requires prompt in-person medical assessment.

What Precautions Should Schools and Nurseries Take?

Hand, foot, and mouth disease can spread easily in nurseries, preschools, and playgroups. However, keeping a child at home until every blister has healed or the virus has completely disappeared from the stool does not fully prevent transmission.

A child should stay at home while they have a fever, feel too unwell to participate in daily activities, or have significant drooling that cannot be managed hygienically. Once the child feels better and the fever has resolved, they may return in accordance with the institution’s health policies. It is not always necessary to wait until every blister has completely healed.

Schools and nurseries may take the following precautions:

• Teach children to wash their hands correctly with soap and water.

• Clean diaper-changing areas after every use.

• Clean toys and frequently touched surfaces regularly.

• Avoid sharing cups, cutlery, towels, and pacifiers.

• Inform families when a child develops symptoms.

• Prevent children from scratching or opening blisters.

How Can Hand, Foot, and Mouth Disease Be Prevented?

Because there is no single routinely used vaccine covering all viruses that cause hand, foot, and mouth disease, hygiene measures remain important.

To reduce transmission:

• Wash hands with soap and water for at least 20 seconds, particularly after toileting, diaper changes, and cleaning the nose.

• Discourage children from touching their eyes, nose, and mouth with unwashed hands.

• Clean toys, door handles, and other frequently touched surfaces regularly.

• Avoid close contact and sharing personal items with an infected person.

• Wash contaminated clothes and bedding appropriately.

• Cover the mouth and nose with a tissue or the inside of the elbow when coughing or sneezing.

Hand sanitiser may be useful in some situations, but it does not completely replace washing with soap and water, particularly after contact with stool.

Plan an Online Paediatrics Consultation With Happ Health

When your child has a mild fever, mouth sores, and a rash on the hands or feet, you may plan an initial consultation with an Online Paediatrics doctor through Happ Health. The doctor can assess when the symptoms began, the appearance of the rash, the child’s fluid intake and urination, and whether there has been recent contact with an infected person.

An online paediatrician can provide guidance on home care, symptoms that should be monitored, and whether an in-person examination is required. A physical examination may still be necessary to inspect the rash closely, assess hydration, or rule out other conditions.

Guided by the principle “Health Everywhere, for Everyone, Always,” Happ Health aims to make access to professional guidance easier for non-emergency child health concerns. An online consultation is not sufficient when the child has severe breathing difficulty, altered consciousness, a seizure, neck stiffness, an inability to drink, or rapidly worsening general health. Emergency medical care should be sought.