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Signs & Symptoms

Mouth sore in a young child

Mouth sore in a young child
(Image ©Mediscan)

Español: Signos y síntomas de la enfermedad de manos, pies y boca

Hand, foot, and mouth disease is a common viral illness that usually affects infants and children younger than 5 years old. However, it can sometimes occur in adults. It usually starts with a fever, reduced appetite, sore throat, and a feeling of being unwell (malaise). One or two days after the fever starts, painful sores can develop in the mouth (herpangina). They begin, often in the back of the mouth, as small red spots that blister and can become ulcers. A skin rash with red spots, and sometimes with blisters, may also develop over one or two days on the palms of the hands and soles of the feet; it may also appear on the knees, elbows, buttocks or genital area.

Some people, especially young children, may get dehydrated if they are not able to swallow enough liquids because of painful mouth sores.

Not everyone will get all of these symptoms. Some people, especially adults, may show no symptoms at all, but they can still pass the virus to others.