Is it true that the resistance of a girl is lower than usual on the days of her menstrual period?

Resistance on those days is indeed lower than usual.

Remember to pay attention to keep warm, drink more hot water do not drink cold, this old tradition can not be ignored, or later on your body will have a great impact.

As for what you said about infectious patients, it is generally nothing. It's impossible to say that you're that immunocompromised just because you're on your period. Just have normal contact as usual.

And you need to wash your bottom and change your underwear every day when you have your period, because the probability of getting gynecological diseases at this time is higher than usual.

It is better not to wash your hair in the first 3 days. Because it will easily lead to poor blood circulation. Therefore, you should pay special attention to keep your body warm, avoid washing your hair and bathing in cold water, and if you really have to wash your hair, you should use a hair dryer to dry it immediately after washing your hair to avoid being exposed to wind chill. Don't wash when you just wake up.