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The hair growth cycleOn average, the human head contains around 100,000 hairs, 90% of which are actively growing at any one time. This growth phase is known as 'Anagen' and is one of three stages in the hair growth cycle. It lasts anything from a couple of years to about six or even ten years in total before the hair enters the second stage, 'Catagen'. This is where over the next few weeks the hair follicle is degraded and the hair stops growing. Finally, the hair enters into the resting phase or 'Telogen' which lasts for several months and during this part of the cycle it is perfectly normal to shed a certain amount of hair, which can be as much as 100 hairs a day.As long as new hair is produced at the same rate as those falling out, there will be no difference in the density of the hair. But if shedding is greater than production, hair loss ensues. Hair thickness varies between individuals. Some finer while others coarser. As we grow older, there is a tendency for our hair fibres to become finer and shorter over excessive cycles. Hair grows from inside a hair bulb deep in a hair follicle (root). Mostly a few hair can grow from one follicle. Each hair grows for a few years. When one hair drops off, (50 100 hair a day) a new hair should grow in its place. A good healthy follicle should reproduce hair by itself. This is the hair cycle.Causes of Hair LossThe follicle is hidden under the scalp. It is connected to the blood vessels and nerves and feeds through the dermal papilla. Stress and medication affects the health of the follicle.