6. Don’t blow your nose in public.
Blowing your nose in public in Japan is considered to be uncouth. Find a bathroom or another private place if you have to attend to a running nose. It’s common to see people wearing face masks in public, especially in the winter. This means they have a cold and want to avoid spreading germs and infecting others (or want to avoid catching one). You can buy these masks in a variety of colors and patterns, and they are — essentially — a fashion statement at this point.