Key Takeaways:
- The hair growth cycle has four stages: anagen (growth), catagen (transition), telogen (resting), and exogen (shedding).
- Every follicle runs on its own timetable, which is why losing some hair every day is completely normal.
- Anagen decides how long your hair can actually grow, and usually lasts two to seven years.
- Catagen is a short transitional phase during which active hair growth stops and the follicle begins to shrink.
- Telogen is the resting phase, where the hair remains in the follicle before the next growth cycle begins.
- Exogen is the shedding phase, when mature hairs are naturally released to make way for new hair growth.
Every hair on the scalp runs on its own timeline. One follicle may be growing a new strand while another is shedding an old one, and a third simply rests. This staggered activity across thousands of follicles is what keeps hair renewing without visible gaps.
The hair growth cycle is divided into four stages: Anagen, Catagen, Telogen, and Exogen. Together, these stages regulate the natural process of hair growth, rest, and shedding.
Understanding these stages makes it easier to tell normal shedding apart from something worth a closer look, since increased hair fall is usually down to a disrupted cycle rather than damaged follicles.
What Is the Hair Growth Cycle?
Every follicle on the scalp moves through the same four phases. Anagen comes first, the active growth stage. Then catagen, brief and transitional, where growth stops and the follicle starts to shrink back. After that, telogen, where the hair rests in place without doing much of anything. Finally exogen, when that resting hair sheds.
What matters clinically is that none of this happens on a shared timer across the scalp. At any moment some hair follicles are growing, others resting, others shedding, all at once, rather than the whole scalp cycling in sync. That staggered pattern is exactly why hair density stays fairly steady day to day, since growth in one group of follicles quietly makes up for shedding in another.
Stage 1: Anagen, the Growth Phase
The very first stage of the hair growth cycle is Anagen, when the follicle is actively producing hair. Matrix cells divide quickly during this stage, pushing growth along at roughly 0.3 to 0.4 mm a day, though this varies from person to person.
It is also the longest stage by a wide margin, typically two to seven years, and it sets the ceiling on how long a strand can eventually get. How long anagen lasts for a given follicle comes down to a mix of things, genetics, age, hormones, nutrition, and how healthy the hair follicle is overall. The longer it stays in this phase, the longer that hair keeps growing before the cycle moves on.
Stage 2: Catagen, the Transition Phase
The second stage of the hair growth cycle is Catagen, is short and marks the end of active growth. Cell division slows down, the lower part of the follicle pulls upward, and the hair shaft loses its blood supply. The hair does not fall out yet though; it stays anchored right where it is, just no longer growing or being fed. The Catagen stage does not last long, usually two to three weeks, before the follicle drops into the resting stage next.
Stage 3: Telogen, the Resting Phase
The third stage of the hair growth cycle is telogen, the follicle goes fairly quiet. Hair production stops, but the strand that is already there stays put while a new hair starts quietly forming underneath it, getting ready for its turn. At any given moment, about 10 to 15% of scalp hair is in telogen, and this stage lasts around two to four months.
Sometimes, more hair follicles than usual slip into telogen at the same time. When that happens, people notice a lot more hair coming out, in the shower drain, on the pillow, caught in a hairbrush, something called telogen effluvium. It can look worrying, but the follicles causing it are usually fine underneath and go back to their normal cycle once things settle.
Stage 4: Exogen, the Shedding Phase
The fourth and final stage of the hair growth cycle is Exogen, when a fully grown hair finally lets go and comes out of the follicle. This is completely normal, not a red flag, and losing 50 to 100 hairs a day fits well within that range.
The follicle does not just sit empty afterward, either; it moves back into anagen almost right away to start growing the next hair.
Where it becomes worth paying attention to is when this balance tips, either too many follicles shedding at the same time, or new hair not growing back fast enough to replace what is lost. That imbalance, not the shedding on its own, is what separates ordinary hair turnover from actual hair loss.
How QR678® Fits Into Hair Wellness
A number of things can throw off the normal hair growth cycle: genetics, hormonal shifts, poor nutrition, stress, and aging among them, all of which can lead to thinning of hair or heavier shedding over time.
QR678® is a non-surgical hair wellness platform with formulations designed to support scalp health and reduce hair fall at different stages of hair thinning. QR678® PREO™ is meant for people noticing early, subtle changes in texture or volume. QR678® NEO® is aimed at more visible changes in hair appearance, while QR678® ZEO™ is built for more advanced or long-standing thinning.
All three are administered only by qualified medical professionals, and which one gets used depends entirely on a proper clinical assessment first.
How to Support a Healthy Hair Growth Cycle
- Eat a diet that actually covers what your body needs.
- Get any nutritional gaps or underlying medical issues treated promptly, not put off.
- Keep stress under control, since it can throw the whole cycle off if it drags on.
- Go easy on your hair and scalp so you are not causing damage that did not need to happen.
- If thinning or shedding keeps up, get it looked at by a qualified medical professional.
Conclusion
Hair grows in a cycle, moving through growth, transition, rest, and shedding, over and over, for as long as we live. Because every hair follicle runs on its own schedule, cycling through anagen, catagen, telogen, and exogen independently of the ones around it, losing some hair every day is simply part of how the system works, not something to worry about.
Trouble tends to start when this cycle gets disrupted, and suddenly you see more than 200 hairs shedding a day instead of 50 to 100, which is not normal. When that happens, shedding can pick up noticeably, or thinning starts to show. Understanding how the cycle actually functions makes it far easier to tell ordinary hair loss apart from something that needs a closer look. If changes in your hair do not settle down on their own, seeing a qualified medical professional remains the best way to find out what is going on and what to do next.
FAQs
What are the four stages of the hair growth cycle?
The four stages are anagen (growth), catagen (transition), telogen (resting), and exogen (shedding). Each one plays its own part in keeping hair renewing naturally.
How long does the full hair growth cycle take?
It varies from follicle to follicle. Anagen alone can run anywhere from two to seven years, while the remaining stages together usually add up to a few months.
How much shedding counts as normal?
Losing 50 to 100 hairs a day is generally considered a normal part of the exogen phase.
Can stress mess with the hair growth cycle?
Yes. Physical or emotional stress can push more follicles into telogen earlier than they should, leading to heavier shedding, a condition known as telogen effluvium.
Can the hair growth cycle actually be disrupted?
Yes. Genetics, hormonal changes, nutritional deficiencies, certain medical conditions, medications, and aging can all alter the cycle and contribute to thinning or excess shedding.
When should I see a doctor about hair shedding?
It is worth getting checked if shedding becomes heavy, keeps going for several weeks, or comes along with noticeable thinning, patchy hair loss, or changes in the scalp.
