Cause of Hair Loss, free ebook for Windows. Learn about the many causes of hair loss and what you can do to prevent it. There are many causes of hair loss. Both men and women can obtain i. It can be because of nutritional deficiency, hormone imbalance, stress, and diseases. But generally the most common cause of it is called adrogenetic alopecia. If you are experiencing greater than normal hair loss, take a look at several things. It is easier to diagnose and correct now than to wait until it is horribly noticeable by others and embarrassing to you.