Though most hair loss is due to genetics, scientists still are not 100% sure why hair loss occurs. There are many factors that can lead to hair loss, such as stress, pregnancy, and of course genetics. However, people used to think if one of your grandfathers was bald, but your dad wasn’t you would still go bald. Scientists now believe there are other genes that lead to why hair loss occurs. Why hair loss happens isn’t so much the issue anymore, but the fact that you can get a hair transplant and get your hair back!