Why Is My Hair Getting Thinner?

One day, you look in the mirror and notice something different.

Perhaps your hairline seems a little higher.

Maybe your part is becoming wider.

Or perhaps you’ve noticed more hair collecting in your brush, on your pillow, or in the shower drain.

At first, you might tell yourself:

“I’m probably just getting older.”

But as the thinning becomes more noticeable, you begin wondering:

“Why is this happening?”

“Is something wrong with my health?”

“Will it keep getting worse?”

And perhaps the most important question:

“Is there anything I can do about it?”

The answer depends on what is causing the hair loss.

Hair thinning is not one condition. It is a symptom that can develop for several different reasons.

Some types of hair loss are temporary.

Others are progressive.

Some respond well to treatment.

And certain conditions require early medical attention to prevent permanent follicle damage.

That’s why I believe the best place to begin is not with a particular hair restoration product or procedure.

It’s with understanding why your hair is thinning in the first place.

Not Sure Where to Start?

Choose the question that sounds most like yours:

• My hair is gradually becoming thinner. → You’re in the right place.
• My hairline is receding. → What Causes Hair Loss in Men?
• My part is getting wider. → What Causes Hair Thinning in Women?
• I’m losing more hair after illness or stress. → Can Stress Cause Hair Loss?
• I’m concerned about hormones or nutrition. → Can Thyroid Problems or Nutritional Deficiencies Cause Hair Loss?
• I’ve heard about TED hair restoration. → What Is TED Hair Restoration, and How Does It Work?

What You’ll Learn

In this chapter, we’ll discuss:

• How hair normally grows
• Why hair becomes thinner
• The difference between shedding and permanent hair loss
• Hereditary hair loss in men and women
• Hormonal changes and hair thinning
• Thyroid problems
• Nutritional deficiencies
• Stress-related hair shedding
• Medication-related hair loss
• Scalp conditions that require attention
• Whether thinning hair can grow back
• How hair loss is evaluated
• Available treatment options
• Where TED hair restoration may fit into the discussion

Quick Answer

Hair thinning can result from several causes, including genetics, hormonal changes, nutritional deficiencies, thyroid disorders, illness, stress, medications, and inflammatory scalp conditions.

The most common cause worldwide is hereditary pattern hair loss, also called androgenetic alopecia.

However, not every person with thinning hair has hereditary hair loss.

The American Academy of Dermatology emphasizes that identifying the underlying cause is essential because different types of hair loss require different treatment approaches.

The most important first step is determining whether your hair follicles are producing progressively thinner hairs, shedding excessively, or being affected by another medical condition.

First, Understand How Hair Normally Grows

Hair doesn’t grow continuously without interruption.

Each follicle follows a repeating growth cycle.

1. Anagen: The Growth Phase

This is the active phase when hair grows.

Scalp hair can remain in this phase for several years.

Most healthy scalp follicles are normally in the growth phase at any given time.

2. Catagen: The Transition Phase

This is a relatively brief period when active growth slows and the follicle transitions toward rest.

3. Telogen: The Resting Phase

The follicle rests before the old hair is shed and a new growth cycle begins.

4. Exogen: The Shedding Phase

The old hair is released.

This is a normal part of the hair cycle.

According to the American Academy of Dermatology, losing approximately 50–100 hairs daily can be normal.

The problem begins when the balance between growth, shedding, and replacement changes.

Why Does Hair Become Thinner?

There are several different ways this can happen.

A follicle may begin producing:

• Finer hairs
• Shorter hairs
• Less pigmented hairs
• Hairs that spend less time growing

Or more follicles may enter the shedding phase than usual.

In some conditions, inflammation damages the follicle itself.

These are very different processes.

And understanding which one is happening helps determine whether treatment may be beneficial.

Cause #1: Hereditary Hair Loss

The most common cause of progressive hair thinning is:

Androgenetic Alopecia

This is commonly called:

• Male pattern hair loss
• Female pattern hair loss
• Hereditary hair loss

Genetics influence how susceptible certain hair follicles are to hormonal signaling.

Over time, susceptible follicles may become smaller.

This process is called:

Follicular Miniaturization

Instead of producing thick, healthy-looking terminal hairs, affected follicles gradually produce finer and shorter hairs.

Eventually, some follicles may stop producing visible hair.

What Does Hereditary Hair Loss Look Like in Men?

Men often notice:

• Receding temples
• A higher hairline
• Thinning at the crown
• A widening bald spot
• Progressive loss across the top of the scalp

The sides and back of the scalp may remain relatively full.

This pattern is often associated with follicular sensitivity to dihydrotestosterone, or DHT.

Importantly, a man does not necessarily have abnormally high testosterone to develop male pattern hair loss.

Genetic follicular sensitivity plays a major role.

What Does Hereditary Hair Loss Look Like in Women?

Women may notice:

• A widening part
• Reduced fullness over the crown
• More visible scalp
• A thinner ponytail
• Gradual diffuse thinning across the top of the head

The frontal hairline is often relatively preserved, although patterns vary.

Women can develop hereditary hair loss even when routine hormone levels are normal.

Cause #2: Hormonal Changes

Hormones influence the hair growth cycle.

Changes associated with:

• Menopause
• Pregnancy and childbirth
• Thyroid disease
• Polycystic ovary syndrome
• Certain hormonal medications

may contribute to changes in hair density or shedding.

However, hormonal changes do not always explain hair thinning.

That’s why a patient’s symptoms and medical history matter.

Why Do Some Women Notice Hair Thinning After Menopause?

During and after menopause, changes in estrogen and other hormonal influences may affect the hair growth cycle.

Some women notice:

• Less overall fullness
• More visible scalp
• A widening part
• Finer hair texture

Hereditary susceptibility may also become more apparent with age.

But menopause should not automatically be blamed for every case of hair loss.

Cause #3: Thyroid Problems

The thyroid helps regulate metabolism and many body processes.

Both an underactive and an overactive thyroid can contribute to hair thinning.

Some patients may also experience:

• Fatigue
• Weight changes
• Temperature intolerance
• Dry skin
• Changes in bowel habits
• Changes in heart rate

If symptoms suggest a thyroid disorder, appropriate testing may be useful.

Treating an underlying thyroid condition may allow hair growth to improve, although recovery can take time.

Cause #4: Nutritional Deficiencies

Hair follicles are metabolically active.

They require adequate nutrients to support normal growth.

Potential contributors to hair loss include inadequate:

• Protein
• Iron
• Zinc
• Certain vitamins and other nutrients

Iron deficiency is especially worth considering when someone has heavy menstrual bleeding, restricted dietary intake, or other risk factors.

But here’s an important distinction:

More supplements do not automatically mean more hair growth.

If someone has normal nutrient levels, taking excessive amounts may provide no benefit and can sometimes cause harm.

Excessive vitamin A or selenium, for example, can contribute to hair loss.

Does Biotin Help Everyone With Thinning Hair?

No.

Biotin is often heavily marketed for hair growth.

But true biotin deficiency is uncommon.

Taking large doses of biotin without a demonstrated need is unlikely to solve most cases of hereditary hair loss.

High-dose biotin can also interfere with certain laboratory tests, including some thyroid and cardiac tests.

Correct a deficiency when one exists. Don’t assume every hair problem is a vitamin deficiency.

Cause #5: Stress-Related Hair Shedding

This is an especially interesting cause because the timing can be confusing.

Someone experiences:

• Major illness
• Surgery
• High fever
• Significant emotional stress
• Rapid weight loss
• Childbirth

Then, several months later, they begin losing more hair.

This can be a condition called:

Telogen Effluvium

A physical or emotional stressor can shift more hair follicles into the resting phase.

The excessive shedding may not become noticeable until approximately two to three months afterward.

Patients often tell me:

“But the stressful event happened months ago!”

Exactly.

That delayed timing can be an important clue.

Will Stress-Related Hair Loss Grow Back?

Often, yes.

When the underlying trigger resolves, excessive shedding frequently improves.

Many patients gradually regain hair fullness over subsequent months.

However, persistent stressors, ongoing medical conditions, or simultaneous hereditary hair loss can complicate recovery.

Not all diffuse shedding should automatically be labeled stress-related.

Cause #6: Medications and Medical Treatments

Some medications can contribute to hair thinning or shedding.

Examples may include certain:

• Cancer treatments
• Blood-thinning medications
• Hormonal medications
• Retinoids
• Other prescription medications

The timing of hair loss relative to starting or changing medication can be helpful.

But never stop a prescribed medication simply because you suspect it is affecting your hair.

Discuss that concern with the prescribing clinician.

Cause #7: Autoimmune Hair Loss

Some forms of hair loss occur when the immune system attacks hair follicles.

One example is:

Alopecia Areata

This often causes smooth, round or oval patches of hair loss.

It can sometimes affect:

• Scalp
• Eyebrows
• Eyelashes
• Beard
• Other body hair

This is different from ordinary hereditary thinning.

A dermatologist can help establish the diagnosis and discuss appropriate treatments.

Cause #8: Scalp Inflammation and Scarring Alopecia

This is one of the most important conditions not to overlook.

Certain inflammatory disorders can damage and eventually destroy hair follicles.

Symptoms may include:

• Scalp redness
• Burning
• Pain
• Itching
• Scaling
• Crusting
• Pustules
• Smooth areas where follicle openings are no longer visible

Some of these conditions can cause permanent hair loss.

A painful, inflamed, or scarred scalp deserves prompt dermatological evaluation.

Cosmetic hair restoration should not delay treatment of an active inflammatory or scarring disorder.

Cause #9: Hairstyles and Hair Damage

Tight hairstyles can place repeated tension on follicles.

This may lead to:

Traction Alopecia

Potential contributors include:

• Very tight braids
• Tight ponytails
• Extensions that pull excessively
• Repeated tension along the hairline

Heat, chemicals, and harsh hair treatments may also cause breakage.

Hair breakage is not always the same thing as loss from the follicle.

Recognizing the difference matters.

Is Hair Thinning Just a Normal Part of Aging?

Hair density and growth patterns can change with age.

But I don’t like dismissing a patient’s concern by simply saying:

“You’re getting older. That’s what happens.”

Age may contribute.

But hereditary hair loss, thyroid disease, nutritional deficiencies, medications, and other conditions may also be involved.

Aging is part of the history.

It shouldn’t automatically end the investigation.

How Do I Know Whether I’m Shedding or Actually Losing Hair?

This is a useful distinction.

Excessive Shedding

You may notice:

• More hair in the shower
• More hair in the brush
• Hair collecting on clothing
• Diffuse loss of fullness

This may occur with telogen effluvium.

Progressive Pattern Hair Loss

You may notice:

• Gradually widening part
• Receding hairline
• Thinning crown
• Finer hairs
• Gradually increasing scalp visibility

This may suggest androgenetic alopecia.

A person can have both conditions simultaneously.

Can Thinning Hair Grow Back?

Sometimes.

The answer depends on the condition and whether the follicles remain capable of producing hair.

For example:

• Temporary shedding may resolve when its trigger improves.
• Nutritional deficiency-related loss may improve after correction.
• Thyroid-related hair loss may improve with appropriate treatment.
• Hereditary pattern hair loss may respond to treatment, particularly when addressed early.
• Scarring alopecia may permanently destroy affected follicles.

This is why early and accurate diagnosis matters.

A living, functioning follicle is different from a follicle that has been permanently destroyed.

What Should a Good Hair Loss Evaluation Include?

A thoughtful evaluation should begin with the patient’s history.

Important questions include:

• When did the thinning begin?
• Was it gradual or sudden?
• Is the hairline receding?
• Is the part widening?
• Is the loss patchy or diffuse?
• Has there been a recent illness?
• Was there surgery or major stress?
• Have medications changed?
• Is there a family history?
• Are there thyroid symptoms?
• Has there been rapid weight loss?
• Are there dietary restrictions?
• Is the scalp painful, red, itchy, or inflamed?

A scalp and hair examination can help distinguish different patterns.

When indicated, a dermatologist may perform dermoscopy, laboratory testing, or a scalp biopsy.

Do I Need Blood Tests?

Not everyone needs the same laboratory tests.

Depending on symptoms and medical history, a clinician may consider:

• Complete blood count
• Ferritin or iron studies
• Thyroid testing
• Selected nutritional tests
• Hormonal testing when clinically indicated

The purpose is not to order every possible test.

It is to investigate reasonable potential causes.

What Treatments Are Available for Hair Thinning?

Treatment depends on the diagnosis.

Options may include:

Treating an Underlying Medical Condition

For example, correcting thyroid dysfunction or an identified nutritional deficiency.

Topical Minoxidil

An established treatment for certain types of pattern hair loss.

Prescription Medications

Finasteride may be appropriate for selected men with male pattern hair loss. Other medications may be considered by qualified clinicians for selected patients.

Low-Level Light Therapy

Certain devices have evidence supporting use in pattern hair loss, although results vary.

Platelet-Rich Plasma

PRP has been studied for some types of hair loss, with variation in protocols and evidence quality.

Hair Transplantation

May be appropriate for selected patients with established pattern hair loss and suitable donor hair.

Other Hair Restoration Technologies

These include technologies intended to influence scalp conditions or deliver topical formulations.

Not all approaches have the same level of clinical evidence.

Where Does TED Hair Restoration Fit?

One treatment patients may hear about is:

TED Hair Restoration

TED stands for TransEpidermal Delivery.

The original Alma TED technology uses acoustic energy to support the delivery of a topical formulation through the scalp without conventional needles.

It is marketed as a noninvasive approach to improving the appearance of thinning hair.

However, it is important to distinguish the original TED system from newer devices, including TED+, which uses a different technology and has its own regulatory documentation.

TED should not be presented as a cure for every type of hair loss, nor should improvement in hair density be guaranteed.

The suitability of any device-based treatment depends on the diagnosis, the particular device and formulation, and the evidence supporting its intended use.

We will devote a separate Learning Center chapter to explaining TED in greater detail.

Is TED Appropriate for Everyone?

No.

For example, a person experiencing hair loss because of:

• Untreated thyroid disease
• Significant iron deficiency
• Active scalp infection
• Scarring inflammatory alopecia
• Medication effects

may need the underlying condition addressed first.

And someone with extensive permanent follicular loss may have different expectations than someone with early thinning.

The right treatment depends on the reason for the hair loss—not simply the desire for thicker hair.

Why Early Evaluation Matters

With some types of progressive hair loss, earlier treatment may offer a better opportunity to preserve existing hair.

But that doesn’t mean every patient needs an immediate cosmetic procedure.

It means that persistent or changing hair loss deserves an appropriate diagnosis.

Be especially attentive to:

• Rapid patchy hair loss
• Loss of eyebrows or eyelashes
• Scalp pain or burning
• Redness or pustules
• Scarring
• Sudden severe shedding
• Hair loss with other systemic symptoms

These findings may warrant timely evaluation by a dermatologist.

How We Approach Hair Restoration at Advanced Integrated Medical

At Advanced Integrated Medical, I believe the first conversation should be about understanding the patient’s concern.

Not simply:

“How many treatments do you want?”

But:

“When did your hair begin thinning?”

“What pattern are you noticing?”

“Has anything changed in your health?”

“What treatments have you tried?”

“What results are you hoping for?”

When a medical or dermatological condition is suspected, appropriate testing or referral is an important part of the process.

Only after the cause and expectations have been considered should a particular hair restoration treatment be discussed.

About Dr. Dee

Dr. D. Scott (“Dee”) Stevens has spent nearly four decades helping patients understand their health concerns and make informed treatment decisions.

Throughout his career, he has cared for patients with musculoskeletal conditions, chronic pain, peripheral neuropathy, and a wide variety of health-related concerns.

One lesson I’ve learned is that a symptom should never be confused with its cause.

That principle applies whether we’re discussing knee pain, nerve symptoms, or thinning hair.

Before choosing a treatment, understand the problem you’re trying to solve.

Dr. Dee’s Clinical Pearl

When someone tells me:

“My hair is falling out,”

I want to ask:

“Is your hair shedding—or are the individual hairs gradually becoming thinner?”

Those may sound like the same thing.

But they can reflect different biological processes.

And the treatment may be different.

Dr. Dee’s Office Conversation

Patient: “Doctor, I’m losing my hair. Is there something that can help?”

Dr. Dee: “Possibly. But first, I’d like to understand what’s causing it.”

Patient: “Doesn’t all hair loss happen because we get older?”

Dr. Dee: “No. Genetics and aging are common factors, but thyroid problems, nutrition, illness, stress, medications, and scalp conditions can also contribute.”

Patient: “So I shouldn’t just start a hair treatment?”

Dr. Dee: “I’d rather make sure we’re addressing the right problem before we decide which treatment makes sense.”

Facing One of the Biggest Fears

“Am I Going to Lose All My Hair?”

That fear is understandable.

Hair can be an important part of how we see ourselves.

But thinning hair does not automatically mean complete baldness.

Some conditions stabilize.

Some are temporary.

Some respond to treatment.

Others require ongoing management.

The key is understanding which condition is present and setting realistic expectations.

Hair Health Success Principle #1

Find the Cause Before You Chase the Cure

It’s easy to be persuaded by advertisements promising:

“Thicker hair in weeks!”

“Reverse baldness!”

“Restore your youthful hair!”

But before investing in a treatment, ask:

• What type of hair loss do I have?
• What is causing it?
• Are my follicles still capable of producing hair?
• Is there an underlying medical condition?
• What evidence supports the treatment?
• What results are realistic?

The best hair restoration plan begins with an accurate diagnosis.

Ask Dr. Dee

“Doctor, should I just start taking hair-growth vitamins?”

Not necessarily.

If you have a nutritional deficiency, correcting it may be important.

But if your thinning is primarily hereditary, taking large amounts of vitamins may do little to address the underlying process.

And excessive supplementation can sometimes cause problems.

My preference is to identify whether a deficiency actually exists before treating one.

A Lesson I’ve Learned in Nearly 40 Years

Patients Deserve More Than a Product Recommendation

When patients seek help, they’re often hoping someone will offer a solution.

But the first solution offered isn’t always the right one.

Sometimes the best first step is:

• A careful history
• A medical evaluation
• Laboratory testing
• A dermatology referral
• Correcting a deficiency
• Changing a medication under medical supervision
• Or simply understanding that a temporary shedding process may improve

A treatment should be recommended because it fits the diagnosis—not because it’s available.

The Hope Principle

Hair thinning can be discouraging.

Some people feel older.

Some become self-conscious.

Others worry that the process is irreversible.

I believe patients deserve hope—but hope that is based on understanding.

For some, the answer may involve treating an underlying medical condition.

For others, it may involve proven medical therapy.

For selected patients, a hair restoration procedure may be worth considering.

And sometimes the most reassuring news is learning that excessive shedding may be temporary.

You don’t have to know the treatment today. Start by understanding the cause.

“I believe the best healthcare decisions are made when patients understand their condition. My job isn’t simply to treat symptoms—it’s to help you understand why they’re happening and what your options are.”

— Dr. D. Scott (“Dee”) Stevens

Frequently Asked Questions

Why is my hair getting thinner as I get older?

Age-related changes and hereditary pattern hair loss are common, but thyroid disease, nutritional deficiencies, medications, and other conditions can contribute.

Can thinning hair grow back?

Sometimes. Regrowth depends on the cause, the condition of the follicles, and whether effective treatment is available.

Is hair thinning hereditary?

It often is, but not always. Hereditary pattern hair loss is the most common cause worldwide.

Can stress make my hair fall out?

Yes. Significant physical or emotional stress can trigger excessive shedding, often several months after the stressful event.

Can low iron cause hair loss?

Yes. Iron deficiency may contribute to hair loss in some patients. Testing and treatment should be guided by clinical findings.

Can thyroid problems cause hair thinning?

Yes. Both underactive and overactive thyroid conditions can affect hair growth.

Do hair-growth vitamins work?

They may help when a relevant deficiency exists, but supplements do not reliably reverse hereditary pattern hair loss in people with adequate nutrition.

What is the difference between hair shedding and pattern hair loss?

Excessive shedding involves more hairs entering the shedding process, often after a trigger. Pattern hair loss typically involves progressive follicular miniaturization and finer hair production.

Is TED hair restoration painful?

The original TED treatment is designed as a noninvasive, needle-free procedure. Individual experiences vary. A future article will explain the procedure, expectations, and limitations in detail.

Does TED hair restoration work for everyone?

No. Results cannot be guaranteed, and the evidence and suitability depend on the specific device, treatment protocol, and type of hair loss.

When should I see a dermatologist?

Seek evaluation for rapid or patchy loss, scalp inflammation, pain, scarring, eyebrow loss, or persistent unexplained shedding. A dermatologist can also help diagnose common pattern hair loss.

Key Takeaways

• Hair thinning is a symptom, not a single diagnosis.
• Hereditary pattern hair loss is the most common cause.
• Men and women often experience different patterns of thinning.
• Hormonal changes may contribute.
• Thyroid disease can affect hair growth.
• Nutritional deficiencies can contribute to shedding.
• Stress-related shedding may be temporary.
• Certain medications may cause hair loss.
• Some inflammatory scalp disorders can permanently damage follicles.
• Not all hair loss requires the same treatment.
• Vitamins are not a universal solution.
• Established treatments are available for certain types of hair loss.
• TED hair restoration is a device-based option that requires careful patient selection and realistic expectations.
• Diagnosis should come before treatment.

Why Patients Choose Advanced Integrated Medical

At Advanced Integrated Medical, we believe patients deserve an explanation before a treatment recommendation.

We want to understand:

When did your hair begin thinning?

What pattern are you noticing?

Is there a family history?

Have there been hormonal or health changes?

Could nutrition or medication be involved?

Is there a scalp condition that needs medical attention?

What are your goals?

And then:

“Which treatment, if any, is appropriate for your particular type of hair loss?”

Our goal is to help patients make informed decisions with realistic expectations.

Continue Exploring the Hair Restoration Learning Center

Upcoming articles include:

• What Causes Hair Loss in Men? Understanding Receding Hairlines and Thinning Crowns
• What Causes Hair Thinning in Women?
• What Is TED Hair Restoration, and How Does It Work?
• Am I a Good Candidate for TED Hair Restoration?
• How Many TED Hair Restoration Treatments Do I Need?
• Can Stress Cause Hair Loss?
• Can Thyroid Problems or Nutritional Deficiencies Cause Hair Loss?

Medical Disclaimer

This article is for educational purposes and does not replace medical evaluation, diagnosis, or individualized treatment.

Hair loss may result from hereditary, hormonal, nutritional, autoimmune, inflammatory, infectious, medication-related, or other medical causes. Some forms can result in permanent follicular damage if not identified and treated promptly.

Treatment options have different indications, risks, benefits, evidence levels, and regulatory status. Device-based hair restoration treatments, including TED, should not be represented as guaranteed to regrow hair or as substitutes for diagnosis and treatment of underlying medical conditions.

Patients with sudden patchy hair loss, painful or inflamed scalp, scarring, or other concerning symptoms should seek evaluation by a qualified healthcare professional, often a dermatologist.

Ready to Learn More?

If your hair is becoming thinner, don’t immediately assume:

“It’s just my age.”

And don’t begin by purchasing every hair-growth product you see advertised.

Instead, ask:

Why is my hair thinning?

Is it hereditary?

Could hormones be involved?

Am I shedding excessively?

Could I have a nutritional deficiency?

Are my follicles still functioning?

Would a medical treatment help?

Could a hair restoration procedure be appropriate?

At Advanced Integrated Medical, we believe understanding your condition is the foundation of making good healthcare decisions.

Understand the cause. Explore the options. Make an informed decision.

Advanced Integrated Medical

Advanced Care • Natural Healing • Real Results