Staff Blog

Influenza Season Has Started Early in Japan

If you are traveling to Japan this autumn or winter, it is important to be aware of influenza (flu).

Influenza usually becomes more common during the colder months in Japan. However, in 2026, influenza activity started earlier than usual.

According to Japan's Ministry of Health, Labour and Welfare (MHLW), Japan entered the influenza epidemic period in late August 2026.

This was reported as the second-earliest start of the influenza epidemic since the current Infectious Diseases Control Law came into effect in 1999, after 2009.

Influenza activity can change quickly, so travelers should be aware of the current situation while staying in Japan.

Why Should Travelers Be Aware of Influenza?

Travel often involves spending time in places where many people gather, such as:

• Airports and airplanes

• Trains and public transportation

• Hotels

• Theme parks and tourist attractions

• Restaurants and shopping areas

Respiratory viruses such as influenza can spread more easily when people spend time in close contact with others.

Getting sick while traveling can affect your plans, so it is important to pay attention to your health during your stay.

Common Symptoms of Influenza

Influenza can develop suddenly and may cause:

• Fever

• Cough

• Sore throat

• Headache

• Muscle or body aches

• Chills

• Fatigue

Symptoms can vary from person to person, and not everyone develops a high fever.

Young children, older adults, and people with certain underlying medical conditions may be at greater risk of developing complications.

How Can You Reduce Your Risk?

Simple measures can help reduce the spread of respiratory infections:

• Wash your hands regularly

• Avoid touching your eyes, nose, and mouth with unwashed hands

• Consider wearing a mask in crowded indoor places

• Get enough sleep and stay hydrated

• Avoid close contact with people who are sick

• If you develop symptoms, avoid crowded places when possible

If You Become Sick During Your Trip

If you develop symptoms such as fever, cough, sore throat, or significant fatigue during your stay in Japan, consider seeking medical advice.

If you experience difficulty breathing, severe weakness, dehydration, confusion, or other severe symptoms, seek medical attention promptly.

If you are traveling in the Maihama area and become unwell, you can contact our clinic for medical consultation.

We provide medical care for both local residents and international visitors.

References

• Ministry of Health, Labour and Welfare (MHLW) – Influenza Information

• Japan Institute for Health Security (JIHS) – Influenza Surveillance

Written and supervised by: Tokyo Bay International Clinic Maihama

Last updated: 9th October, 2026