There are lots of factors that cause hair loss, including stress, vitamin deficiency, hormonal problems, and genetics. It is possible to reverse the hair loss caused by stress and vitamin deficiency, but hair loss due to genetics is permanent. However, you can slow down the hair loss process. By consulting with a doctor, take Finasteride and Minoxidil treatment to promote hair growth. Consider using hair loss shampoos and haircare products. If the hair loss is due to stress, try to manage it. If the hair loss is a result of vitamin or protein deficiency, eat a healthy diet and take hair loss supplements.