The Hair Growth Cycle Explained: Why Your Hair Grows, Rests, and Sheds
Ever wondered why some hairs seem to grow forever while others fall out? It all comes down to your hair's natural growth cycle.
Hair growth isn't a continuous process where every strand grows at the same time. In fact, each hair follicle follows its own cycle of growing, transitioning, resting, and shedding.
Understanding this process can help explain why you lose hair in the shower, why hair growth takes time, and why maintaining a healthy scalp is an important part of your overall haircare routine.
At Lucid Head Spa in Solana Beach, California, we believe beautiful, healthy-looking hair begins with understanding what's happening at the scalp.
Let's explore the four stages of the hair growth cycle and what they mean for your hair health.
1. Anagen Phase: The Growth Stage
What's happening: Your hair is actively growing from the follicle.
Anagen is the longest phase of the hair growth cycle and the stage responsible for producing new hair length.
During this phase, cells in the hair follicle rapidly divide, allowing the hair shaft to grow.
For scalp hair, the anagen phase generally lasts between 2–7 years, although the duration varies based on genetics, age, health, and other factors.
At any given time, approximately 85–90% of scalp hairs are typically in the anagen phase.
During this stage:
Hair follicles actively produce hair.
Hair grows an average of approximately half an inch per month.
The length of the growth phase helps determine how long your hair can grow.
Genetics and overall health influence the growth process.
Why it matters: Hair growth takes time. Supporting your overall health and addressing scalp concerns can help create favorable conditions for healthy hair, but no topical treatment or head spa can guarantee faster growth.
2. Catagen Phase: The Transition Stage
What's happening: Active hair growth slows and the follicle begins to shrink.
After the growth phase, the follicle enters a short transitional period called catagen.
During this stage, hair production stops and the lower portion of the follicle regresses.
The catagen phase typically lasts around 2–3 weeks.
Only a small percentage of your scalp hairs, often around 1%, are in this phase at a given time.
Think of catagen as your hair follicle preparing to transition from active growth into rest.
Why it matters: This stage is a normal and necessary part of the hair growth cycle. Your follicles aren't designed to produce hair continuously without periods of transition and rest.
3. Telogen Phase: The Resting Stage
What's happening: The follicle is resting, and the existing hair is no longer actively growing.
During telogen, the hair remains in place while the follicle goes through a resting period.
This phase commonly lasts approximately 2–3 months, although the duration can vary.
Around 10–15% of scalp hairs may be in the resting phase at any given time.
This is also why certain types of hair shedding don't appear immediately after a triggering event.
For example, significant illness, major stress, surgery, or hormonal changes may cause more hairs than usual to enter the resting phase.
The resulting shedding can become noticeable several months later.
Why it matters: If you're experiencing increased hair shedding today, the contributing factor may have occurred weeks or months earlier.
4. Exogen Phase: The Shedding Stage
What's happening: The old hair strand is released from the follicle.
Exogen is the phase when a resting hair is shed, making room for continued cycling within the follicle.
It's completely normal to lose hair every day.
Most people shed approximately 50–100 hairs daily, although normal shedding varies based on hair density, washing frequency, styling habits, and individual factors.
You may notice shedding:
In the shower or while shampooing
While brushing or detangling
On your pillow
During a scalp massage
When taking down hairstyles
Seeing strands come out during a head spa treatment doesn't automatically mean the treatment is causing hair loss. Normal shedding hairs may become more noticeable when the hair is washed or manipulated.
However, excessive shedding, bald patches, or progressive thinning should be evaluated by a healthcare professional.
Why it matters: Shedding is a natural part of the hair growth cycle. A hair falling out doesn't necessarily mean the follicle has stopped functioning.
The Four Stages of Hair Growth at a Glance
Stage
What happens
Typical duration
Anagen
Active hair growth
2–7 years
Catagen
Growth stops and the follicle transitions
2–3 weeks
Telogen
The follicle rests
2–3 months
Exogen
The old hair strand is shed
Varies; overlaps with other cycle stages
These estimates apply primarily to scalp hair and vary between individuals.
What Can Disrupt Your Hair Growth Cycle?
Your hair follicles are constantly responding to changes within your body.
Several factors can influence the hair growth cycle, including:
Stress and illness: Significant physical or emotional stress can trigger telogen effluvium, a condition involving increased shedding.
Hormonal changes: Pregnancy, postpartum changes, menopause, and certain thyroid conditions can affect hair growth and shedding.
Nutritional deficiencies: Inadequate iron, protein, or other essential nutrients can contribute to hair concerns.
Genetics: Hereditary hair loss can gradually shorten the active growth phase and affect hair follicle size.
Scalp conditions: Significant scalp inflammation and certain medical conditions can interfere with normal hair growth.
Haircare practices: Excessive heat, chemical processing, and tight hairstyles can cause breakage or traction-related hair loss.
Identifying the underlying cause is important because not all hair thinning or shedding responds to the same treatment.
How Does Scalp Health Affect Hair Growth?
Your scalp is the living environment that houses your hair follicles.
Healthy scalp skin supports normal follicle function, while concerns such as excessive buildup, irritation, and inflammation may affect scalp comfort and, in some cases, contribute to hair problems.
Proper scalp care may include:
Regular cleansing to remove excess oil, sweat, and styling products
Gentle exfoliation when appropriate
Maintaining a comfortable, balanced scalp environment
Addressing flaking, itching, and irritation
Avoiding harsh or overly aggressive treatments
However, it's important to distinguish between supporting scalp health and medically treating hair loss.
Scalp cleansing and massage can improve comfort and the cosmetic condition of the hair, but they haven't been proven to reliably extend the anagen phase, restart inactive follicles, or reverse genetic hair loss.
Can a Head Spa Help Support Healthy Hair?
A professional head spa can be a wonderful addition to your scalp wellness routine.
At Lucid Head Spa in Solana Beach, we focus on targeted scalp care, thorough cleansing, and relaxation.
Our personalized head spa experiences may help:
Remove excess surface oil and product buildup
Improve scalp cleanliness and comfort
Condition hair for softness and manageability
Provide a relaxing scalp massage
Help you better understand your scalp's visible condition
We also offer microscopic scalp analysis, allowing our providers to examine the scalp surface under magnification and identify cosmetic concerns such as visible buildup, excess oil, or flaking.
For guests focused on thinning hair or scalp wellness, our Grow & Flow treatment provides a specialized scalp-care experience.
While scalp treatments can support a comfortable, well-maintained scalp, they should not replace medical evaluation or evidence-based treatment for persistent hair loss.
Frequently Asked Questions About the Hair Growth Cycle
What are the four stages of the hair growth cycle?
The four commonly described stages are anagen (growth), catagen (transition), telogen (rest), and exogen (shedding). Each hair follicle cycles through these stages independently.
How long does the hair growth cycle last?
The complete cycle varies by person and follicle. Scalp hair can remain in the anagen growth phase for several years, followed by shorter transition and resting phases before shedding.
Is it normal to lose hair every day?
Yes. Losing approximately 50–100 hairs daily is generally considered normal. The amount you notice may vary depending on your washing schedule, hair length, and other factors.
Why am I suddenly shedding more hair?
Temporary increased shedding can occur after illness, major stress, childbirth, significant weight loss, or hormonal changes. In some cases, shedding becomes noticeable two to three months after the triggering event.
If shedding is persistent, severe, or accompanied by other symptoms, a dermatologist can help identify the cause.
Does scalp massage stimulate hair growth?
Scalp massage may promote relaxation and scalp comfort, but evidence that it meaningfully increases hair growth is limited. It should not be considered a proven treatment for hair loss.
How can I encourage healthy hair growth?
Focus on adequate nutrition, gentle haircare, appropriate scalp cleansing, and identifying underlying medical concerns if you're experiencing unusual shedding or thinning. Hair growth is influenced by genetics, hormones, and overall health.
Can a head spa help with hair shedding?
A head spa can help maintain scalp cleanliness and improve comfort, but it cannot reliably stop excessive shedding or treat underlying hair loss conditions. Guests experiencing unusual or progressive hair loss should seek medical evaluation.
Healthy Hair Begins With Understanding Your Scalp
Your hair is constantly moving through stages of growth, rest, and shedding, even when you can't see those changes happening.
Understanding the hair growth cycle can help you set realistic expectations, recognize what's normal, and make more informed decisions about caring for your scalp and hair.
At Lucid Head Spa in Solana Beach, CA, we believe scalp care should be both relaxing and personalized.
Our luxurious head spa treatments combine private treatment rooms, microscopic scalp analysis, targeted scalp cleansing, and restorative massage to create a customized scalp wellness experience.
Whether you're dealing with buildup, dryness, scalp discomfort, or simply want to prioritize your scalp health, we're here to help.
Ready to give your scalp the attention it deserves?
Book a head spa treatment at Lucid Head Spa in Solana Beach, conveniently serving Encinitas, Del Mar, and North County San Diego.