Edit The anatomy of hair

<p>It is this part of the structure which is responsible for how quickly our hair grows, dividing every 23-72 hours – the fastest of any part in the body.</p> <p>As these cells divide, they push up older cells which slowly die and form the shaft, or what we understand to be hair.</p> <p>Hair goes through four phases in its life, and each individual strand will be at a different stage to others.</p> <p>Its active growth stage is called the anagen period, which lasts between two to seven years.</p> <p>This is the stage in which our hair grows and the more time the hair stays in it, the longer it will become.</p> <p>The hair’s next, transitional stage is its catagen phase in which the follicle shrinks to around a sixth of its usual length and detaches from the papilla that feeds it, after which a new hair begins to form in its place.</p> <p>This normally lasts around two to three weeks and, on an average head of hair, around 1-2% at any given time will be in this phase.</p> <p>After this, the hair rests for around two to four months in what is known as the Telogen phase before it falls out and is replaced with a new hair in the Exogen stage.</p> <p>We shed approximately 100 hairs per day from these different phases, which is completely normal and not a sign of hair loss.</p>

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