For many men, the thought of losing their hair is worrisome. Let's face it. If your dad lost his hair, you may as well. Right? Male pattern hair loss is also known as male pattern baldness. In short, it is the most common cause of hair loss in men. There may be steps you can take to prevent it and you may be able to seek out treatment for it to officially overcome it. But, what is it and why does it happen? For those men noticing a bit more scalp peeking through their hair each day, it is important to understand what this is and why it is happening to you.