There are four fundamental forces in the universe. These are the familiar gravitational and electromagnetic forces as well as the not so familiar strong nuclear force and weak nuclear force. Your hair is normally held down against your head the gravitational force from the earth. There are some exceptions , but most people's hair lays flat. If you are outside in a lightning storm, you may notice that your hair starts to stand on end.
Some good advice is to stay indoors during a lightning storm.
If your hair is standing up, then you are in extreme danger.