The hair growth cycle has 3 stages:

  1. Anagen: Growth period of a hair follicle that typically lasts about 3 to 5 years.
  2. Catagen: At the end of the growth period, the follicles are prepared for the resting phase. This stage of the hair growth cycle usually lasts 1 to 2 weeks.
  3. Telogen: Rest period of the follicle that normally lasts from 3 to 4 months. At the end of this period many hairs will end their life cycle and fall, letting the new ones begin to grow.