There are many possible reasons for hair loss, ranging from genetic to environmental. One of the most common hair loss causes is genetics, resulting in alopecia or male pattern baldness (which occurs in women as well as men). Although alopecia causes cannot be prevented, there are several possible approaches to addressing this cause of hair loss, including hair transplantation surgery, medications, and laser therapy. In other cases, the reasons for hair loss may be related to an individual’s environment or lifestyle. Hair loss causes may include illness or disease (such as thyroid disease or anemia), certain medications (including chemotherapy), or lifestyle factors like smoking, stress, alcohol consumption or exposure to UV rays or chemicals. The best way to determine the cause of your hair loss is to see your physician.