What should I do if the weather is wet and my knee hurts?

A little rheumatism! You should go to the hospital to see rheumatoid disease. Rheumatism may be caused by weather and soil. Because the south is a place with relatively high humidity, some northerners can't adapt to the weather in the south, which is also a reason for the acclimatization.

Go to the supermarket to buy knee pads, which can protect your joints! Protect your joints when you sleep! Don't let moisture enter your body again!

Go to the hospital sometime.