Hair grows at various stages and these are known as the growth, regression and resting stages. When the hair begins to grow, this is known as the anagen stage.

As it approaches the regression stage, this is known as the catagen stage. The resting stage is known as the telogen stage.

Hair growth occurs from its root at the papilla in the dermis layer. New, soft hair cells are continually produced and die here. It takes around seven years for a fully grown terminal hair to be shed and replaced by a new hair.

There are about 100,000 hairs on the human scalp and usually people lose 70-100 hairs every day as the hair follicle enters the resting or catagen stage.