Though there exists on the Internet a myriad of explanations of causes for hair losses, broadly speaking I could just classify the causes of hair loss into two categories: 1) internal causes 2) external causes
Internal causes of hair loss stem from the body of the individual hair loss sufferer. Such causes could be due to the biological changes the sufferer experiences. Male pattern baldness is one type of baldness caused by the internal factors when the DHT levels in the sufferer’s body build up and attack the hair follicles.
External causes of hair loss stem from the environment surrounding the hair loss sufferer. Some forms of external causes of hair loss is the stress from workplace and using heavy chemicals on one’s hair.
However, we must note that the causes of hair loss can be contributed by both internal and external factors. For example, when one has a stressful and hectic lifestyle, he may have improper diet and insufficient exercise; as a result his internal body starts to break down: thus the external cause of hair loss leads to the internal cause as well, and both then contribute to hair loss.