Hair loss in women is more common than we talk about. Some experts say 1 in 3 women will experience some form of hair loss over their lifetime. Not all hair loss is due to the same reason, and sometimes it can indicate more serious underlying health problems that require medical attention.
One reason your hair has started thinning might be because that's what happens to the women in your family. In fact, you may have been expecting thin hair for awhile now, based on your mom's or sister's hair.