If you’ve ever wondered why your hair grows for years, suddenly starts shedding, or seems to stop growing altogether, the answer often lies in the hair growth cycle.
Every hair on your scalp follows a natural cycle of growth, transition, rest, and shedding. Understanding this cycle helps explain why some hair loss is normal while other changes may require medical attention.
At PURE Medical Spa Hair Restoration, we believe understanding the hair growth cycle is the first step before choosing PRP, PRF, regenerative treatments, or other hair restoration options through PURE Hair ReGrow.
Book your FREE Hair Restoration Consultation with PURE Hair ReGrow today.
What Is the Hair Growth Cycle?
The hair growth cycle is the natural process that every hair follicle follows throughout its life. Instead of all hairs growing at the same time, each follicle operates independently. This is why you do not lose all your hair at once.
The normal hair growth cycle has four stages:
Anagen Phase
Catagen Phase
Telogen Phase
Exogen Phase
Each stage plays an important role in maintaining healthy hair density.
Stage 1: Anagen Phase – The Active Growth Stage
The anagen phase is the longest and most active stage of the hair growth process.
During this phase:
Hair actively grows from the follicle.
Cells inside the follicle divide rapidly.
Hair becomes longer and thicker.
Most scalp hairs are in this stage.
The anagen phase may last 2 to 7 years, depending on genetics, age, and overall health.
The longer this stage lasts, the longer your hair can grow.
Stage 2: Catagen Phase – The Transition Stage
The catagen phase is a short transition period lasting only a few weeks.
During this phase:
Hair growth slows.
The follicle shrinks.
Blood supply to the follicle decreases.
The hair prepares to enter its resting stage.
Only a small percentage of scalp hairs are in the catagen phase at any given time.
Stage 3: Telogen Phase – The Resting Stage
The telogen phase is the resting period of the hair growing cycle.
During this stage:
Hair remains attached.
No active growth occurs.
New hairs begin forming underneath.
The follicle prepares for natural shedding.
Around 10-15% of scalp hairs are normally in the telogen stage.
Stress, illness, surgery, childbirth, or nutritional deficiencies can push more follicles into this stage, leading to increased shedding.
Stage 4: Exogen Phase – Natural Shedding
The exogen phase is the final stage of the hair life cycle.
During this phase:
Older hairs naturally fall out.
New hairs begin replacing them.
Daily shedding becomes part of a healthy cycle.
Most people lose about 50 to 100 hairs daily during this stage.
Seeing hair in your shower or brush is often a normal part of the hair growth timeline.
How the Hair Growth Cycle Affects Hair Loss
One of the most common questions patients ask is, how does the hair growth cycle affect hair loss?
Hair loss can occur when this cycle becomes disrupted.
Examples include:
The anagen phase becomes shorter.
Too many follicles enter the telogen phase.
Follicles become miniaturized.
New hairs grow back thinner.
The growth cycle slows after illness or hormonal changes.
This explains why some patients notice increased shedding while others experience gradual thinning.
Hair Growth After Hair Loss
Healthy hair growth after hair loss depends on the condition of the hair follicle.
If follicles remain alive, they may return to a healthy hair regrowth cycle after the trigger is corrected.
However, if follicles become permanently scarred or inactive, natural regrowth becomes much less likely.
This is why early diagnosis matters.
Can the Hair Growth Cycle Be Restored?
Many patients ask, can the hair growth cycle be restored?
In many cases, yes.
If follicles are still healthy, treatments may help support a more normal hair growth pattern by improving scalp health and reducing factors that interfere with growth.
Depending on your diagnosis, treatment may include:
Medical-grade scalp care
Nutrition support
PRP Hair Restoration
PRF Hair Restoration
Regenerative therapies
Lifestyle recommendations
The goal is to support healthier follicles-not simply reduce shedding.
Hair Growth Facts Most People Don’t Know
Here are a few interesting hair growth facts:
Every follicle follows its own individual cycle.
Hair grows approximately ½ inch per month on average.
Around 90% of healthy scalp hairs are usually in the anagen stage.
Hair growth slows naturally with age.
Poor scalp health can affect the hair growth science behind healthy follicles.
Understanding these facts helps explain why results from treatment often take several months.
Why Healthy Hair Growth Depends on More Than Just the Follicle
A healthy hair growth cycle relies on both strong follicles and a healthy scalp. During the different hair growth stages, each hair shaft receives nutrients and oxygen through tiny blood vessels that supply the follicle. If this blood supply is reduced, hair may become weaker over time.
Different types of hair respond differently to aging, hormones, and environmental factors, so not every case of thin hair has the same cause.
When the active phase of the hair becomes shorter, some follicles may appear as though they have stopped growing, causing finer hair strands and increased shedding.
Nutritional deficiencies, chronic inflammation, and other factors contributing to hair loss can disrupt a healthy hair cycle and may eventually lead to hair loss if left untreated.
Modern treatment options focus on preserving active follicles, helping stimulate hair growth, and reducing the number of hairs that hairs fall prematurely.
For appropriate candidates, platelet rich plasma PRP (PRP treatment) may support healthier follicles by improving the scalp environment, although results vary depending on the underlying diagnosis.
The earlier changes are identified, the greater the opportunity to maintain treated hair, reduce the risk of a bald spot, and support long term hair health before permanent follicle damage occurs.
How PURE Hair ReGrow Supports Healthy Hair Growth
At PURE Medical Spa Hair Restoration, every treatment begins with understanding your hair cycle.
Through the PURE Hair Growth Program, our physician-led team evaluates:
Hair density
Hair growth phase
Scalp health
Follicle condition
Medical history
Lifestyle factors
Hair growth timeline
Depending on your diagnosis, your plan may include:
Hair Follicle Analysis
Hair Follicle Regeneration
Hair Stem Cell Therapy
PRP Hair Restoration
PRF Hair Restoration
Every recommendation is personalized because every patient’s hair growth cycle is different.
Book Your PURE Hair Growth Consultation
If you are concerned about slow growth, thinning, or excessive shedding, understanding your hair growth cycle is the best place to start.
Book your PURE Hair Growth Consultation today.
📞 Call/Text: 312.312.7873
Or schedule your FREE complimentary telehealth consultation online.
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FAQs
What are the stages of the hair growth cycle?
The four stages are anagen, catagen, telogen, and exogen.
How long is the hair growth cycle?
The complete cycle varies, but the anagen growth phase alone can last 2 to 7 years.
What is the anagen phase of hair growth?
The anagen phase is the active stage when hair grows continuously from the follicle.
How does the hair growth cycle affect hair loss?
Disruption of the cycle can increase shedding, shorten growth, and contribute to thinning.
Can the hair growth cycle be restored?
In many cases, healthy follicles can return to a more normal growth cycle with appropriate treatment.
Research References
- NCBI – Anatomy, Hair
- https://www.ncbi.nlm.nih.gov/books/NBK513312/
- StatPearls – Hair Physiology and Growth Cycle
- https://www.ncbi.nlm.nih.gov/books/NBK470434/
- International Journal of Trichology – Biology of Hair Follicles
- https://pmc.ncbi.nlm.nih.gov/articles/PMC3999645/
- American Academy of Dermatology – Hair Loss Resource Center
- https://www.aad.org/public/diseases/hair-loss