Healthy hair does not grow continuously. Every hair follicle follows a natural pattern of growth, rest, and renewal known as the hair growth cycle. Understanding these hair growth phases can help explain why some shedding is completely normal while other changes may signal an underlying hair problem.
Many people worry when they notice extra hair in the shower or on their pillow. However, hair loss is not always a sign of permanent thinning. In many cases, it reflects a normal stage of the hair growth process.
At PURE Medical Spa Hair Restoration, the PURE Hair Growth Program begins by understanding your natural hair cycle before recommending PRP, PRF, regenerative treatments, or other hair restoration options.
Book your FREE Hair Restoration Consultation with PURE Hair ReGrow today.
Why the Hair Growth Cycle Matters
Every hair follicle works independently. This means each follicle is usually in a different stage of the hair growth cycle, preventing all hairs from shedding at once.
The normal hair growth cycle has four phases:
- Anagen Phase
- Catagen Phase
- Telogen Phase
- Exogen Phase
Each phase plays a different role in maintaining healthy hair density.
Phase 1: Anagen Phase – Active Hair Growth
The anagen phase is the longest and most important of all hair growth phases.
During this stage:
- Hair actively grows.
- Follicle cells divide rapidly.
- The hair shaft becomes longer and thicker.
- Most scalp hairs remain in this phase.
The anagen phase usually lasts between two and seven years, depending on genetics, age, and overall health.
A longer active growth phase often allows hair to grow longer.
Phase 2: Catagen Phase – The Transition Stage
The catagen phase is much shorter.
This stage lasts only a few weeks and serves as a transition between growth and rest.
During the catagen phase:
- Hair growth slows.
- The follicle shrinks.
- Blood supply decreases.
- The follicle prepares for the resting stage.
Only a small percentage of scalp hairs are normally in this phase.
Phase 3: Telogen Phase – Resting Hair
The telogen phase is often called the resting stage.
During this phase:
- Hair remains attached to the scalp.
- Active growth stops.
- New hairs begin forming beneath the old ones.
- The follicle prepares for shedding.
Normally, about 10–15% of scalp hairs remain in the telogen stage.
Stress, illness, surgery, childbirth, medications, or nutritional deficiencies can push more follicles into this resting phase. This condition is called telogen effluvium, one of the most common causes of temporary hair shedding.
According to the NCBI StatPearls – Telogen Effluvium, telogen effluvium occurs when an unusually large number of follicles enter the resting phase at the same time.
Phase 4: Exogen Phase – Natural Hair Shedding
The exogen phase is the final step of the hair growth stages.
During this phase:
- Older hairs are released.
- New hairs begin replacing them.
- Daily shedding becomes part of a healthy cycle.
This is why losing 50 to 100 hairs each day is considered normal.
The exogen phase ensures that new healthy hairs continue replacing older ones throughout life.
Hair Growth Timeline: Why Results Take Time
Many patients expect rapid improvement after starting treatment.
However, your hair growth timeline depends on the natural hair cycle.
Even after successful treatment:
- Shedding may continue temporarily.
- New growth usually takes several months.
- Visible improvement often appears gradually.
- Hair density continues improving over time.
Understanding this timeline helps set realistic expectations.
How Hair Growth Phases Affect Hair Loss
One of the most common questions is, how do the hair growth phases affect hair loss?
Hair loss often occurs when the cycle becomes disrupted.
Examples include:
- The anagen phase becomes shorter.
- Too many follicles enter the telogen stage.
- Follicles become miniaturized.
- The resting phase lasts longer than normal.
- New hairs grow back thinner.
The earlier these changes are identified, the more treatment options may be available.
Healthy Hair Growth Depends on Healthy Follicles
A healthy hair growth cycle depends on healthy follicles.
Follicles need:
- Good blood supply
- Balanced hormones
- Proper nutrition
- Healthy scalp tissue
- Minimal inflammation
When these conditions are present, the hair cycle can continue normally.
Why Timing Matters More Than Most People Realize
Many people focus on how much hair they lose, but hair specialists pay close attention to when it is lost. Every stage of hair has a purpose, and understanding where your follicles are in the hair life cycle helps explain why some treatments work better than others.
- During anagen hair growth, the follicle is highly active, making it the ideal time to stimulate hair growth and support healthier hair strands.
- Once a follicle enters catagen hair, growth naturally slows as the dermal papilla temporarily reduces its activity before the follicle moves into the telogen resting phase.
- It is completely normal for a club hair to be released during telogen hair shedding and exogen hair shedding. This is why a small amount of hair sheds or hair falls every day, even in people with healthy hair.
- When shedding becomes excessive, the cause may be one of several types of hair loss, nutritional deficiencies, or another medical condition affecting the hair and scalp. In selected cases, a scalp biopsy may be recommended to clarify the diagnosis.
- Hair typically grows about ½ inch per month, but this varies depending on genetics, age, hormones, and overall scalp health. Identifying where your follicles are in the cycle helps determine whether a treatment is likely to be effective before changes lead to hair thinning.
- Through PURE Hair ReGrow, every PURE Hair Growth Consultation at PURE Medical Spa Hair Restoration focuses on understanding your unique hair cycle so the PURE Hair Growth Program can recommend physician-led care at the right time,not just the right treatment. This is the foundation of Physician-Led Hair Restoration Chicago.
How PURE Hair ReGrow Supports Healthy Hair Growth
At PURE Medical Spa Hair Restoration, every patient begins with a PURE Hair Growth Consultation.
Instead of recommending treatment immediately, we evaluate:
- Hair density
- Hair growth stage
- Scalp health
- Medical history
- Hair loss pattern
- Lifestyle factors
Depending on your diagnosis, recommendations may include:
- Hair Follicle Analysis
- PRP Hair Restoration
- PRF Hair Restoration
- Regenerative therapies
- Medical-grade scalp care
This physician-led approach helps support healthy hair regrowth while protecting existing follicles.
Book Your Hair Growth Consultation
If you are concerned about excessive shedding, slow growth, or thinning hair, understanding your hair growth phases is the first step.
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 four stages of hair growth?
The four stages are the anagen, catagen, telogen, and exogen phases.
What is the anagen phase of hair growth?
The anagen phase is the active growth stage when hair grows continuously from the follicle.
What happens during the telogen phase?
During the telogen phase, the hair rests while new hair begins developing beneath it.
How long does the hair growth cycle last?
The complete cycle varies, but the anagen phase alone can last two to seven years.
How do the hair growth phases affect hair loss?
Disruption of the natural cycle can increase shedding, shorten growth, and contribute to thinning.