The NHS says that hair loss is not usually anything to be worried about, but occasionally it can be a sign of a medical condition. It adds that a GP should be able to tell you what’s causing your hair loss by looking at your hair. For older women, hormonal changes that are linked with menopause also contribute to hair loss. If daily hair loss is any greater than 100 hairs per day, gradual thinning may occur. This often becomes increasingly noticeable in later years, when hair growth slows down.