Stages of hair growth?
Hair growth occurs in three main stages: anagen (active growth phase lasting 2-7 years), catagen (transitional phase lasting 2-3 weeks), and telogen (resting phase lasting 2-4 months). During anagen, the hair follicles are actively producing hair; in catagen, hair growth stops and the follicles shrink; and in telogen, old hairs are shed to make way for new growth.