How Each Hair Growth Cycle Impacts Your Hair

Every hair follicle moves through a continuous cycle of growth, transition, rest, and shedding. These phases regulate normal hair density and daily shedding, but disruptions in the cycle can sometimes contribute to noticeable thinning or long-term hair loss.

Understanding how the hair growth cycle works may help explain why hair changes happen — and when increased shedding may signal something more than a normal cycle.

The Three Stages of the Hair Growth Cycle

Each hair follicle moves independently through three primary stages:

Anagen — the active growth phase

Catagen — the short transition phase

Telogen — the resting and shedding phase

Because follicles cycle at different times, most people naturally shed hair daily without noticeable thinning.

Anagen Phase

The Active Growth Stage

The anagen phase is the active growth stage of the hair cycle. During this period, cells within the follicle divide rapidly, allowing hair to continuously grow longer and thicker over time. Approximately 80–90% of scalp follicles are normally in the anagen phase at any given time.

Duration: 2–7 years

Characteristics: Active hair growth Strong follicle activity Determines maximum hair length

Catagen Phase

The Transitional Stage

Catagen is a short transition phase where the hair follicle stops actively growing and detaches from its blood supply. This stage signals the end of active growth before the follicle enters a resting period. Only a small percentage of hairs are in this phase at one time.

Duration: 2–3 weeks

Characteristics: Growth stops Follicle shrinks Hair detaches from blood supply

Telogen Phase

The Resting & Shedding Stage

Telogen is the resting stage of the hair cycle. During this phase, older hairs remain in place while new hairs begin forming beneath them. Eventually, the older hair sheds naturally as the cycle begins again.

Duration: 2–4 months

Characteristics: Resting follicle activity Natural shedding occurs New growth prepares to restart

Is Daily Hair Shedding Normal?

Shedding approximately 50–100 hairs per day is considered a normal part of the hair growth cycle. Because individual follicles cycle independently, healthy shedding usually happens gradually rather than in obvious patches.

Temporary increases in shedding may occur after stress, illness, hormonal shifts, nutritional deficiencies, or significant life events.

When Hair Shedding Becomes Hair Loss

Normal shedding and progressive hair loss are not always the same thing. When the anagen phase shortens or a large number of follicles shift into the telogen phase at once, noticeable thinning may begin to develop.

Common signs include:

• increased shedding in the shower or on pillows

• widening part lines

• thinning at the crown temple

• recession reduced overall density

Persistent changes may sometimes indicate underlying hair loss conditions rather than temporary shedding alone.

What Can Disrupt the Hair Growth Cycle?

Several factors may interfere with the normal growth cycle, including genetics, hormonal changes, inflammation, stress, nutritional deficiencies, medications, and certain medical conditions.

One of the most common causes is androgenetic alopecia, also known as pattern hair loss, which gradually miniaturizes hair follicles over time.

Understanding the underlying cause is important because different conditions affect the cycle differently — and not every form of shedding represents permanent hair loss.

Understanding Hair Cycle Changes More Clearly

Changes in shedding, density, or hair texture can happen gradually and may not always follow the same pattern in every patient. Hair loss may present differently depending on genetics, age, hormones, scalp condition, and hair type.

Explore our additional educational sections to better understand how hair loss affects men, women, and different hair types — and how disruptions in the hair cycle may influence long-term hair health.