Around 80-90% of all the hair on your scalp is in different stages of active growth. Each hair follicle has a specific life cycle. There are three distinct phases of the hair cycle: anagen, catagen, and telogen.
Anagen is an active growth phase of the hair cycle. This phase differs from person to person and can last between two to six years.
Catagen is a transitional step that lasts between two and three weeks. It is a transition from the active phase to the resting phase of the hair cycle. About 3% of your hair is in the catagen phase at any given time.
Telogen is the “resting” phase of your hair cycle. No hair growth occurs at this point. Around 25 to 100 hairs shed off every day due to the telogen phase. The telogen phase lasts about three months, and after that, go into the anagen phase, and active growth starts.