Why does dry weather cause headache and fatigue?

First, it has something to do with air pressure. If you feel uncomfortable, try to avoid exercise and stay in a place where the sun is not strong. Also, because your body fluids are exhausted, you should drink more water and take more vitamins. Your headache may also be due to lack of oxygen. Don't go to places with heavy pollution and low oxygen. Do some aerobic exercise in a better environment, and your symptoms should be alleviated.