Japan is a safe country to travel, but there is always the possibility of natural disasters cause by earthquakes, heavy rains, and storms.
You may also begin to feel sick.
Here are some good sources of information and support for visitors in case of emergency.
If you begin to feel sick, please use the Japan Visitor Hotline, which is open 24 hours a day, every day of the year. It can also be used for any inquiries related to coronavirus.
“Japan National Tourism Organization (JNTO) operates a visitor hotline 24 hours a day, 365 days a year. Call for tourist information or assistance in the case of accidents and emergencies. Support is available in English, Chinese, Korean and Japanese.”
Call from inside Japan: 050-3816-2787
Call from outside Japan: +81-50-3816-2787
GoTokyo is The Official Tokyo Travel Guide. This page has helpful information and links about disaster preparedness. Take a look to learn more about what to do in case a strong earthquake should occur. In addition, there is also information about who to contact in case you have lost something valuable while traveling. If you notice early that you have left something on a train, you can usually also contact staff at the station.
The Japan Meteorological Agency provides weather and natural disaster information (such as basic weather info, heavy rains, high temperatures, earthquakes, tsunamis, volcanic activity, etc.) in 14 languages. Please check this page for information on what to do in such an emergency.