Timespan of the Hair Growth Cycle The anagen phase constitutes about 90% (1000 days or more) of the growth cycle. The catagen phase (10 days) and telogen phase (100 days) constitute only 10% of the hair growth cycle. During the catagen and telogen phase of the hair growth cycle, as hairs are at the shedding and rest-from-growth period, no bald spots are shown as hairs are randomly distributed over the scalp.
As all hairs are shed at the end of their growth cycle, some degree of hair loss is accepted as normal in every individual. During the resting stage of the hair growth cycle the hair relaxes its hold on the hair root and the bulb of the hair shaft moves closer to the surface of the skin. Over time, usual hair movements, shampooing and brushing causes the hair root to loosen further. Eventually, the hair is shed. The shedding of around 50 to 150 hairs per day by this way is normal. On following days, the hair follicle grows a new hair to replace the one, which is shed.
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