Overview: Hand, Foot & Mouth Disease in Japan
Hand, foot and mouth disease (手足口病, *te ashi kuchi byō*) — commonly abbreviated HFMD — is a viral illness that primarily affects infants and children under 10 years old. In Japan, it is a well-known summer disease, with epidemics typically peaking from June through September. Japanese public health authorities track HFMD closely, issuing weekly sentinel surveillance reports that parents and childcare facilities monitor during peak season.
For international families visiting Japan during the summer, HFMD is a genuine concern. The disease spreads through contact with an infected person's saliva, mucus, stool, or fluid from blisters — exactly the modes of transmission common in places like theme parks, swimming pools, children's museums, and other attractions popular with tourist families.
The vast majority of HFMD cases are mild and self-limiting, resolving within 7–10 days without any specific medical treatment. However, certain strains — particularly Enterovirus 71 (EV-A71) — can cause severe neurological complications including encephalitis in rare cases. EV-A71 has been responsible for serious HFMD outbreaks across Asia, and Japan remains vigilant about monitoring for it.
Parents visiting Japan with young children should know where the nearest pediatric clinic is, and what to watch for in terms of warning signs requiring emergency care.
Symptoms and Diagnosis
HFMD typically progresses through recognizable stages over 5–7 days:
Stage 1 (Days 1–2): Initial symptoms
- Fever (usually 38–39°C)
- Sore throat
- Loss of appetite
- Irritability
Stage 2 (Days 2–4): Characteristic rash and sores
- Painful mouth sores (ulcers on tongue, gums, inside of cheeks)
- Flat or raised red spots on palms of hands and soles of feet
- Rash may also appear on buttocks, knees, and elbows
- Blisters develop from some spots (fluid-filled, not usually itchy)
Body Area | Appearance |
|---|---|
Mouth | White/yellow ulcers, very painful, may prevent eating |
Hands (palms) | Red spots or blisters, 2–5mm |
Feet (soles) | Similar to hands |
Buttocks / legs | Flat red spots, less commonly blisters |
Diagnosis in Japan:
Japanese pediatricians diagnose HFMD clinically — by examining the characteristic rash pattern and mouth sores. There is no routine rapid test. A doctor will ask about the child's fever history, contact with other sick children, and carefully examine the skin and oral cavity. Stool testing or throat swabs for enterovirus typing are reserved for complicated or severe cases.