Hair loss is normally associated with men. Twenty-five percent begin balding by age 25, and two-thirds by age 60. But women experience hair loss, too, for a variety of reasons, including medications, illnesses, infections and chemicals. These things can weaken your hair, causing damage and breakage. It’s normal to lose 40 to 120 strands of hair a day, so there’s no need to panic when we see strands in our hair brush. It can be an unsettling feeling, though, to suddenly start losing more hair, or to start noticing gradual hair loss in the mirror. If you notice more hair than usual in your hair brush or on your pillow.