The Hair Growth Cycle Explained

Hair doesn't just grow forever -- it moves through a repeating cycle of growth, rest, and shedding.

Growth phase (Anagen)

During anagen, the hair follicle's root actively divides and produces new cells, making this the phase where hair actually grows -- and it takes up the largest share of the overall cycle by far. It typically lasts several years, varying by person, and the longer this phase runs, the greater the potential for hair to grow long. Most of the hair on a healthy scalp is in this phase at any given time.

Transition phase (Catagen)

Cell division at the root stops and the follicle begins shrinking in this brief transitional phase that wraps up active growth. It typically lasts only a few weeks, during which the follicle regresses and the hair gradually gets pushed up toward the scalp surface.

Resting phase (Telogen)

The follicle becomes fully inactive and rests during this phase, and hair in telogen sits loosely anchored at the root. It usually lasts a few months, after which the hair either falls out naturally or gets pushed out as the next growth cycle begins with a new hair. A large share of everyday natural shedding happens as hairs finish this phase.

Shedding phase (Exogen)

This is the phase where hair that has finished resting actually detaches and comes out of the scalp, sometimes considered the tail end of telogen rather than a fully separate phase. Most of the hair that comes out naturally during shampooing or brushing is in this phase, and losing roughly 50-70 strands a day this way is considered within the normal range.

How the phases are typically distributed

On a healthy scalp, the large majority of hair sits in the growth phase at any given time, with only a small share in the resting phase -- that's the typical, healthy distribution. When that balance shifts and a much larger share of hair ends up in the resting phase, the result is commonly called telogen effluvium, which can appear temporarily after childbirth, major surgery, intense stress, or rapid weight change.

How the cycle connects to hair loss

In progressive hair loss conditions like androgenetic alopecia, the growth phase gradually shortens over successive cycles and follicles miniaturize, which is why hair tends to become finer and shorter over time. The cycle itself is a completely normal process, but if noticeably more hair is coming out during a given period, or hair overall feels like it's thinning, it's worth figuring out whether that's just natural cycle variation or a sign of progressing hair loss.

What the hair growth cycle actually is

A single strand of hair doesn't just keep growing forever -- it repeats a cycle of growth, transition, rest, and shedding phases before falling out and being replaced. Not every hair is on the same phase at the same time; each individual follicle runs through this cycle on its own independent schedule, which is exactly why losing a certain amount of hair every single day is completely normal rather than a sign of trouble.

If hair loss is a concern

If you're noticing noticeably more hair falling out than usual, or your hair generally feels like it's thinning, it's worth checking your shedding against typical baseline numbers and reviewing basic prevention habits.

Frequently Asked Questions

Can I make my hair grow faster?

The length of the growth phase itself is heavily influenced by genetics, so there's not much room to meaningfully speed it up on purpose. That said, keeping your scalp healthy and your nutrition solid can help hair make full use of whatever growth phase it has.

Does stress really cause noticeable hair loss?

Yes -- significant stress or a major physical shock to the body can push an unusually large number of follicles into the resting phase all at once, leading to a surge in shedding a few months later known as telogen effluvium. It usually resolves on its own once the underlying cause settles down, but if it persists, it's worth seeing a specialist.