What are the cause of hair loss?

Some think it is hereditary, so it runs in families, also if there is a severe burn the hair will not grow back because the layer of skin in which hairs follicles grow will be destroyed as well from constant rubbing in one area can cause the hair to stop growing in certain spots has to do with proteins and stuff!!What are the cause of hair loss?
one is believed to be too much testorone.What are the cause of hair loss?
There can be many different reasons for hair loss but one of the biggest reasons is stress!
Genes is the big reason. if you have any one in your family who has hair loss most likely you will too. But one trick i know is to wash your hair with cold water to close the pores in your head that holds the hair, instead of using hot water because it will open the pores.
stress and genetics (genes)

microdermabrasion