It is very cold today. After I looked down at my mobile phone for more than two hours, my head suddenly fainted. I want to know why. Is it related to the cold weather?

This should have nothing to do with the weather. Mobile phones radiate a lot. Looking down at your mobile phone for two hours is very bad for your eyes. It may be dizziness caused by the eyes. If you are anemic, you will feel dizzy if you bow your head for two hours in a row. I suggest that you don't watch your mobile phone for too long, and you can take a proper rest to relieve fatigue.