The resting stage of hair growth is called the telogen phase. During this period, which typically lasts two to four months on the scalp, the hair follicle stops producing new cells and the strand simply sits in place without growing. At any given time, roughly 5% to 10% of the hairs on your head are in this resting state.
How the Hair Growth Cycle Works
Each hair on your body cycles through four distinct phases independently of the hairs around it. The active growth phase (anagen) is the longest, lasting two to seven years on the scalp. During anagen, cells in the hair bulb divide rapidly, pushing the strand upward and adding length. Next comes a short transitional phase (catagen) lasting a few weeks, during which cell division stops and the lower portion of the follicle shrinks. The follicle then enters the telogen, or resting phase, before eventually moving into the exogen phase, when the old hair is released and shed.
Because each follicle operates on its own timeline, you don’t lose all your hair at once. The staggered cycling means that while some hairs are growing, others are resting, and a small number are actively shedding. This is why losing 50 to 100 hairs a day is completely normal.
What Happens Inside the Follicle During Telogen
By the time a hair enters the resting phase, its structure has already changed. During the transition from active growth, the base of the hair strand condenses into a rounded, bulb-like shape called a club. This club hair moves upward within the follicle to the level of the tiny muscle attached to it (the arrector pili, the same muscle that gives you goosebumps). The entire lower segment of the follicle, which was responsible for producing the hair, breaks down.
If you’ve ever pulled out a hair and noticed a small white bulb at the root, that’s a club hair. It looks distinctly different from an actively growing hair, which has a darker, more elongated root surrounded by a sheath. During telogen, the club hair stays loosely anchored in the follicle. It doesn’t grow, but it doesn’t fall out right away either. Meanwhile, deeper in the follicle, the early stages of a new hair are already beginning to form.
Telogen vs. Exogen: Resting vs. Shedding
A common point of confusion is the difference between the resting phase and actual hair shedding. Telogen is when the hair sits dormant. Exogen is the extension of this stage when the old hair finally detaches and falls out, often helped along by washing, brushing, or simply running your fingers through your hair. During exogen, which can last several months on its own, the new replacement hair is already growing underneath. So by the time an old strand drops, its successor is well on its way.
Why the Resting Phase Length Varies by Body Area
The telogen phase is a major reason why hair on different parts of your body grows to different lengths. Scalp hair has a long growth phase (years) and a relatively short resting phase (two to four months), which is why it can grow very long. Eyebrow and body hair, by contrast, have much shorter growth phases and longer resting phases. This means those hairs spend more of their life cycle sitting still and less time actively lengthening, which is why your eyebrows never grow to your shoulders no matter how long you leave them alone.
What Signals the Follicle to Wake Up
The transition from resting back to active growth isn’t random. It’s controlled by competing chemical signals within the skin. Growth-promoting proteins push the follicle toward waking up, while inhibitory signals keep it dormant. The balance between these two determines when telogen ends.
Telogen itself has two sub-stages. In the early “refractory” period, the follicle resists reactivation no matter what signals it receives. Later, during the “competent” or “inductive” period, the follicle becomes receptive to growth signals and can re-enter the active phase. Growth-promoting signals essentially override the inhibitory ones, triggering the follicle to start building a new hair from scratch. Research in mice has shown that blocking the inhibitory signals can significantly shorten the refractory period and accelerate hair regeneration, which is one reason these pathways are of interest for hair loss treatments.
When Too Many Hairs Enter Telogen at Once
Normally, only a small fraction of your scalp hairs are resting at any given time. But certain stressors can push a large number of follicles into telogen simultaneously, a condition called telogen effluvium. The result is noticeable, diffuse thinning or shedding that typically appears two to three months after the triggering event, because that’s how long the resting phase lasts before those hairs start to fall out.
Common triggers include major surgery, serious illness, high fever, significant weight loss, pregnancy and childbirth, emotional distress, and starting or stopping certain medications. Even mental stress, like preparing for a major exam or adjusting to a new job, can be enough. One frustrating pattern is that the emotional distress caused by the shedding itself can become its own stressor, feeding the cycle forward.
The good news is that 95% of telogen effluvium cases resolve on their own within two to three months after the triggering stressor is removed. Because the follicles were never damaged, just prematurely shifted into rest, they’re fully capable of cycling back into growth. The timeline feels long, though: you may not notice real improvement for four to six months after the stressor ends, since the follicle needs time to exit telogen, begin growing, and produce enough new length to be visible. Patience is genuinely the primary treatment for most cases.
How to Tell If Your Hair Is in the Resting Phase
You can’t feel when a hair enters telogen, and you won’t notice it happening on a strand-by-strand basis. The clearest sign is when a hair finally sheds during exogen. If you examine a shed hair and see a small, dry, white or light-colored bulb at the root with no surrounding sheath, that’s a club hair that completed its resting phase normally. A hair pulled from an active growth phase, by contrast, will have a darker, moist-looking root, sometimes with a translucent covering.
Dermatologists can assess the ratio of resting to growing hairs using a technique called a trichogram, where a small sample of hairs is examined under a microscope. If more than about 20% to 25% of sampled hairs show the characteristic club shape, it suggests an unusually high proportion of follicles are in telogen, which may point to telogen effluvium or another underlying issue.