I've read some articles saying that healthcare services are currently under pressure in Japan.
Over 70% of Tokyo's COVID infection routes unknown, health care services under pressure - The Mainichi
When asked about the tight situation at medical institutions during an interview after the meeting, Inokuchi replied, "A sore throat or fever is not a sign of a serious condition. I hope everyone will see a doctor after making a calm decision."
The implication here seems to be that services are under pressure because people are seeking medical help or seeing a doctor when it's not necessary.
I don't know about Japan, but in the UK it's always been made very clear that you should NOT see a doctor if you have/suspect you have COVID. Only seek medical help (via the phone initially) if you need urgent medical attention, struggling to breathe etc.