Why Is My Hair Falling Out? 12 Common Causes of Hair Loss in Men and Women Seeing extra hair in your brush, on your pillow, or in the shower can feel stressful. Many people in San Jose ask the same question: “Why is my hair falling out?” Hair loss is very common. It can happen to men and women of all ages. Sometimes it happens slowly over time. Other times, it can happen suddenly. The good news is that hair loss often has a cause that can be identified and treated. Here are 1