But an important fact is often missed:

Hair falling out does not automatically mean you are becoming permanently bald.

Hair can disappear for many completely different reasons.

Some hair loss is:

• normal,
• temporary,
• genetic,
• nutritional,
• hormonal,
• autoimmune,
• medication-related,
• caused by illness,
• caused by hairstyles or chemicals,
• or caused by inflammation that can permanently damage the follicle.

The medical term for hair loss is alopecia.

And the most important question isn’t simply:

“How do I stop my hair fall?”

It is:

“Why is my hair falling out?”

Finding the cause determines whether the hair is likely to return naturally, requires treatment, or needs urgent attention before follicles become permanently damaged.

This guide explains the major causes of hair loss, how to recognize their typical patterns, and when medical evaluation is important.

First: Some Hair Falling Out Is Completely Normal

Hair does not remain attached to the scalp forever.

Every follicle repeatedly moves through a biological growth cycle.

Anagen — Growth Phase

The hair actively grows.

Scalp hair can remain in this phase for several years.

Catagen — Transition Phase

Growth stops and the follicle temporarily shrinks.

This phase normally lasts only a few weeks.

Telogen — Resting Phase

The follicle rests for several months.

Eventually the old hair is released while a new growing hair begins underneath it.

Because thousands of follicles are cycling independently, losing some hair every day is normal.

Dermatology references commonly consider roughly 50–100 shed hairs per day within the normal range, although the visible number varies according to hair length, washing frequency, hairstyle, and individual biology.

Therefore:

Seeing hair in the shower ≠ automatically having hair loss disease.

The important changes are things such as:

• suddenly shedding much more hair than usual,
• progressively seeing more scalp,
• a receding hairline,
• widening of the central part,
• thinning at the crown,
• bald patches,
• broken hairs,
• or areas where hair no longer grows.

Hair Shedding, Hair Thinning and Hair Breakage Are Different

People commonly describe all three as “hair fall,” but medically they are not the same.

Hair Shedding

The entire hair naturally separates from the follicle.

Examples include:

• normal daily shedding,
• telogen effluvium,
• postpartum shedding.

Hair Thinning

The follicle continues producing hair, but each new hair gradually becomes smaller and finer.

This happens prominently in androgenetic alopecia, or pattern hair loss.

Hair Breakage

The follicle may be perfectly healthy, but the hair shaft snaps.

Common causes include:

• bleaching,
• chemical straightening,
• excessive heat,
• aggressive brushing,
• repeated friction.

Understanding which of these is happening dramatically narrows the possible cause.

Quick Hair-Loss Pattern Guide

This table is only a guide. Several forms of hair loss can exist at the same time.

1. Genetics: The Most Common Cause of Progressive Hair Loss

The most common cause of hair loss worldwide is hereditary androgenetic alopecia.

It affects both men and women.

In Men

It is commonly called:

Male-pattern hair loss / male-pattern baldness

Typical progression includes:

• recession around the temples,
• an M-shaped hairline,
• thinning at the crown,
• gradual thinning across the top.

In Women

It is commonly called:

Female-pattern hair loss

It more commonly produces:

• widening of the center part,
• reduced density across the top,
• increasing visibility of the scalp,
• preservation of much of the frontal hairline.

The underlying problem involves genetically susceptible follicles gradually becoming smaller.

A thick terminal hair becomes:

thick hair → thinner hair → shorter hair → miniaturized hair → barely visible hair

This process may begin surprisingly early.

The American Academy of Dermatology notes that hereditary follicle shrinkage can begin during the teenage years, although it commonly becomes noticeable later.

2. DHT and Androgen Sensitivity

One of the major biological drivers of male-pattern hair loss is dihydrotestosterone, or DHT.

DHT is produced from testosterone through an enzyme called 5-alpha reductase.

However, the problem is not simply “having too much testosterone.”

Some people’s scalp follicles are genetically much more sensitive to androgen signalling.

In susceptible follicles:

Testosterone

↓

5-alpha reductase

↓

DHT

↓

Androgen receptor

↓

Progressive follicle miniaturization

This explains why two men with similar hormone levels can have completely different hairlines.

One may retain thick hair into old age while another begins receding in his early twenties.

Genetics determines much of that susceptibility.

3. Telogen Effluvium: One of the Most Common Causes of Sudden Hair Shedding

Someone may have thick healthy hair and suddenly start losing hundreds of hairs.

A common explanation is telogen effluvium.

Something stresses the body and causes an unusually large number of growing follicles to enter the resting phase.

The confusing part is the delay.

The stressful event might happen today.

Hair shedding frequently becomes obvious approximately 2–4 months later.

Potential triggers include:

• high fever,
• significant infection,
• surgery,
• hospitalization,
• major physical trauma,
• childbirth,
• rapid weight loss,
• severe calorie restriction,
• nutritional deficiency,
• major psychological stress,
• thyroid disorders,
• certain medications.

The shedding usually occurs across the entire scalp rather than creating one completely bald patch.

Fortunately, acute telogen effluvium is generally non-scarring, meaning the follicles remain present and hair can recover once the trigger resolves.

4. Severe Psychological Stress

People often say:

“Stress made my hair fall out.”

There is some truth to this—but it is frequently misunderstood.

Normal everyday stress does not necessarily make everyone suddenly bald.

More significant physiological or psychological stress can trigger telogen effluvium in susceptible people.

Examples might include:

• death of someone close,
• major relationship breakdown,
• extreme work stress,
• severe anxiety,
• traumatic events,
• prolonged sleep disruption combined with other stressors.

Hair usually doesn’t fall immediately during the stressful event.

Because of the hair cycle, shedding often becomes noticeable months later.

5. Fever and Serious Illness

A significant illness can disrupt normal hair cycling.

Examples include:

• severe viral illness,
• prolonged fever,
• major infections,
• hospitalization,
• serious systemic disease.

Again, the hair commonly begins shedding after the person has already recovered.

That timing sometimes makes the connection difficult to recognize.

6. Surgery and Physical Trauma

Major surgery places considerable physiological stress on the body.

Factors can include:

• anesthesia,
• inflammation,
• blood loss,
• reduced food intake,
• medication,
• recovery stress.

Several months later, diffuse shedding may occur.

This again often represents telogen effluvium rather than destruction of hair follicles.

7. Rapid Weight Loss and Crash Dieting

One of the most overlooked causes of hair shedding is losing weight too quickly.

The follicle is metabolically active and requires adequate energy and nutrients.

Extreme calorie restriction may signal to the body that resources should be conserved.

Common scenarios include:

• crash diets,
• prolonged fasting,
• very-low-calorie diets,
• eating disorders,
• rapid weight-loss programs,
• substantial illness-related weight loss.

A person can therefore lose significant weight successfully and then notice dramatic hair shedding several months later.

The weight loss may be intentional—but the physiological stress can still affect hair cycling.

8. Low Protein Intake

Hair shafts are made primarily from the structural protein keratin.

Severe or prolonged protein deficiency can interfere with normal hair production.

People at greater risk can include those following:

• extremely restrictive diets,
• poorly planned weight-loss diets,
• diets with inadequate protein,
• severe malnutrition,
• illnesses affecting nutrient absorption.

The American Academy of Dermatology identifies inadequate protein intake as one nutritional cause of hair loss.

9. Iron Deficiency

Iron deficiency is one of the nutritional problems commonly investigated in people experiencing diffuse hair shedding.

Risk may be greater with:

• heavy menstrual bleeding,
• restrictive diets,
• pregnancy,
• gastrointestinal bleeding,
• inadequate dietary intake,
• malabsorption.

Iron stores are often assessed using tests including serum ferritin, although interpretation depends on the person’s overall medical context.

Iron deficiency should be corrected when present.

However, taking high-dose iron without evidence of deficiency is not a smart hair-growth strategy; excessive iron can cause harm.

10. Zinc Deficiency

Zinc participates in numerous cellular processes involved in normal skin and follicle biology.

Severe zinc deficiency can contribute to hair loss.

It may occur with:

• malnutrition,
• malabsorption,
• certain gastrointestinal diseases,
• highly restrictive diets,
• rare inherited conditions.

But more zinc is not automatically better.

Evidence supporting zinc supplementation in people whose zinc levels are already adequate is limited, and excessive zinc can cause toxicity and interfere with copper metabolism.

11. Vitamin D

Vitamin D has received enormous attention in modern hair-loss research.

A 2024 systematic review and meta-analysis found vitamin D deficiency was common among people with several alopecia conditions, with stronger associations demonstrated particularly for alopecia areata and female-pattern hair loss. However, an association does not automatically prove that low vitamin D caused the hair loss or that supplements will reverse it.

So the reasonable approach is:

Test when clinically appropriate → correct genuine deficiency → don’t assume mega-dosing vitamin D cures baldness.

12. Biotin Deficiency

Biotin has become almost synonymous with “hair vitamins.”

But true biotin deficiency is uncommon in otherwise healthy people eating a varied diet.

When genuine deficiency exists, it can affect hair.

However:

Biotin supplements have not been proven to reverse genetic hair loss simply because someone takes more biotin.

High-dose biotin can also interfere with some laboratory tests.

The sensible strategy is therefore to treat a deficiency when one exists—not assume that every person losing hair needs biotin.

13. Too Much Vitamin A or Selenium

An interesting paradox:

Some nutrients can contribute to hair loss when there is too little.

Others can cause hair loss when there is too much.

Excessive vitamin A and selenium intake have both been associated with hair loss.

This is one reason blindly combining multiple:

• multivitamins,
• hair gummies,
• herbal products,
• mineral supplements,

can sometimes backfire.

14. Thyroid Disease

Both insufficient and excessive thyroid activity can disturb normal hair cycling.

Possible thyroid-related hair changes include:

• diffuse thinning,
• dry or brittle hair,
• increased shedding.

Hair loss alone does not establish thyroid disease.

But if shedding occurs alongside symptoms such as:

• unusual fatigue,
• temperature intolerance,
• unexplained weight changes,
• heart-rate changes,
• menstrual changes,

thyroid evaluation may be appropriate.

Treating the underlying thyroid condition can often allow hair recovery.

15. Polycystic Ovary Syndrome — PCOS

PCOS can produce increased androgen activity in some women.

Possible signs include combinations of:

• irregular menstrual cycles,
• acne,
• increased facial/body hair,
• difficulty with weight management,
• scalp thinning.

The irony is that androgen excess can simultaneously cause:

more hair on the face/body

while contributing to:

less hair on the scalp.

PCOS-related hair loss should therefore be treated as part of the overall hormonal condition rather than simply covered with a cosmetic hair product.

16. Pregnancy and Postpartum Hair Shedding

During pregnancy, hormonal changes can keep more hairs in the growing phase.

Hair may therefore appear unusually thick.

After childbirth, hormone levels change rapidly and many follicles enter the resting phase.

Several months later:

large amounts of hair may suddenly shed.

This is commonly called postpartum hair loss.

Although dramatic, it is usually temporary.

The American Academy of Dermatology reports that postpartum shedding often peaks around four months after childbirth, with fullness generally returning over subsequent months.

17. Hormonal Changes and Birth Control

Starting or stopping certain hormonal contraceptives can alter hormone levels and occasionally trigger temporary shedding.

Not every woman experiences this.

When it occurs, the pattern can resemble telogen effluvium.

Hormonal changes may also expose an underlying genetic tendency toward female-pattern hair loss.

18. Menopause

Hormonal changes surrounding menopause can contribute to changes in scalp-hair density.

As estrogen levels change and the relative influence of androgens increases, genetically susceptible follicles may progressively miniaturize.

This can contribute to female-pattern hair loss.

Age-related changes in follicle growth also begin accumulating at the same time.

19. Alopecia Areata: When the Immune System Attacks Hair Follicles

Imagine suddenly discovering a perfectly smooth circular bald patch.

One important possibility is alopecia areata.

This is an autoimmune disease.

The immune system mistakenly targets hair follicles.

It can affect:

• scalp hair,
• eyebrows,
• eyelashes,
• beard,
• body hair.

Some people develop only one or two patches.

Others may develop extensive loss.

The encouraging part is that the autoimmune attack usually does not permanently destroy the follicle, so regrowth remains possible.

A dermatologist should evaluate suspected alopecia areata because modern treatments differ significantly from treatment for ordinary pattern baldness.

20. Scarring Alopecia: One of the Most Important Causes Not to Miss

Some types of hair loss permanently destroy the follicle.

These are collectively called:

cicatricial alopecia / scarring alopecia.

Inflammation attacks and eventually replaces follicles with scar tissue.

Once a follicle has been completely destroyed:

it cannot produce another hair.

Examples include:

• lichen planopilaris,
• frontal fibrosing alopecia,
• central centrifugal cicatricial alopecia,
• discoid lupus erythematosus,
• folliculitis decalvans,
• dissecting cellulitis.

Possible warning signs include:

• burning,
• scalp pain,
• severe itching,
• redness,
• pustules,
• crusting,
• shiny bald areas,
• disappearance of visible follicle openings.

This is one category where early dermatological evaluation really matters, because treatment aims to stop additional follicles from being destroyed.

21. Fungal Infection of the Scalp — Tinea Capitis

Fungal scalp infections can cause hair loss.

Tinea capitis is particularly common in children but can occur in adults.

Possible signs include:

• scaling,
• itching,
• broken hairs,
• “black dots” where hairs have broken near the scalp,
• patches of hair loss,
• inflammation.

A severely inflamed form called a kerion may become swollen and painful.

Because tinea capitis infects the hair follicle itself, ordinary cosmetic anti-dandruff shampoo is generally not enough; proper antifungal treatment may be necessary.

22. Severe Scalp Inflammation

Conditions affecting the scalp can indirectly contribute to shedding or breakage.

Examples include:

• severe seborrheic dermatitis,
• psoriasis,
• eczema,
• inflammatory folliculitis.

Scratching and inflammation can worsen shedding and physically loosen or break hairs.

For example, scalp psoriasis can be accompanied by temporary hair loss, with hair generally regrowing after the scalp disease is brought under control.

23. Traction Alopecia: Hairstyles Can Pull Hair Out

Repeated physical tension can damage hair follicles.

This is called traction alopecia.

Possible triggers include repeatedly wearing:

• very tight ponytails,
• tight buns,
• cornrows,
• braids,
• locs,
• hair extensions,
• tightly attached weaves.

Early traction alopecia may be reversible.

But continued pulling over long periods can create scarring and permanent follicle destruction.

A hairstyle should not consistently cause:

• pain,
• scalp tenderness,
• stinging,
• bumps,
• broken hairs around the hairline.

Those can be warning signs that the tension is excessive.

24. Bleaching, Straightening, Perming and Chemical Damage

Hair outside the scalp is not living tissue.

Once the shaft has been severely damaged, the body cannot “heal” it in the same way it repairs skin.

Repeated exposure to:

• strong bleach,
• chemical relaxers,
• permanent dyes,
• perming agents,

can weaken the shaft.

The hair may then:

• become brittle,
• split,
• break,
• appear significantly thinner.

This may look like follicular hair loss even when the underlying follicle remains healthy.

Severe repeated chemical damage combined with scalp injury can potentially cause more lasting problems.

25. Excessive Heat

Repeated high-temperature styling can damage the hair shaft.

Potential sources include:

• flat irons,
• curling irons,
• very hot blow-dryers,
• heated rollers.

Heat damage usually causes breakage rather than genetic-style follicle miniaturization.

Reducing temperature and frequency can help protect new hair as it grows.

26. Aggressive Brushing and Friction

Repeated pulling and friction can contribute to hair breakage.

Examples include:

• aggressive detangling,
• repeatedly pulling knots,
• constant friction,
• harsh towel drying.

AAD also recognizes frictional alopecia, in which chronic rubbing can cause localized hair loss on areas of the body.

27. Trichotillomania: Compulsive Hair Pulling

Trichotillomania is a condition involving repeated urges to pull out one’s own hair.

The person may pull hair from:

• scalp,
• eyebrows,
• eyelashes,
• beard,
• other body areas.

The result commonly looks different from alopecia areata because hairs of many different lengths can remain.

Some people pull unconsciously while:

• studying,
• watching television,
• working,
• experiencing anxiety.

Repeated pulling can eventually damage follicles.

Treatment addresses the behavioral/psychological condition rather than merely trying to stimulate hair growth.

28. Chemotherapy

Chemotherapy targets rapidly dividing cells.

Cancer cells divide rapidly—but cells responsible for producing hair also divide rapidly.

Some chemotherapy drugs therefore interrupt active hair growth.

The resulting condition is called anagen effluvium.

Unlike telogen effluvium, which commonly appears months after a trigger, anagen effluvium can begin within weeks.

Hair may be lost from:

• scalp,
• eyebrows,
• eyelashes,
• body.

Hair often begins growing again after treatment ends, although recovery can vary according to the treatment used.

29. Radiation Treatment

Radiation directed at the scalp can damage hair follicles.

Whether hair regrows depends partly on the radiation dose.

Lower exposures may cause temporary loss.

Higher doses can produce permanent follicle damage.

Radiation elsewhere in the body generally does not make scalp hair fall out in the same way as radiation directly involving the scalp.

30. Other Medications

Hair loss or increased shedding can occur as a side effect of certain medications.

Drug-related shedding can involve different biological mechanisms.

Classes reported in association with hair loss include some:

• anticoagulants,
• retinoids,
• anticonvulsants,
• cardiovascular drugs,
• psychiatric medicines,
• hormonal medications,
• immunomodulatory drugs.

The exact risk varies significantly between drugs and individuals.

Most importantly:

Do not stop a prescribed medication simply because you suspect it is causing hair loss.

Stopping some medications abruptly can be dangerous.

Instead, discuss the timing and symptoms with the prescribing physician.

31. Toxins and Poisoning

Certain toxins can interfere dramatically with hair production.

Examples described in medical literature include:

• thallium,
• arsenic,
• mercury.

Excessive exposure to some substances and nutrients can also cause shedding.

These causes are uncommon, but they become important when hair loss occurs alongside other unexplained systemic symptoms.

32. Autoimmune and Systemic Diseases

Hair loss can sometimes be a manifestation of a broader medical condition.

Examples include:

• systemic lupus erythematosus,
• thyroid disease,
• severe chronic illness,
• autoimmune disease.

In these situations, treating only the scalp may miss the real problem.

33. Syphilis and Certain Infections

Untreated secondary syphilis can occasionally cause patchy hair loss, sometimes described as a “moth-eaten” appearance.

Hair can generally recover once the infection is properly treated.

Hair loss accompanied by unexplained systemic symptoms or relevant infection risk should therefore be medically evaluated rather than treated only with cosmetic products.

34. Age-Related Hair Thinning

Even without classic baldness, hair biology changes with age.

Follicles may:

• spend less time actively growing,
• produce thinner shafts,
• regenerate more slowly.

Consequently, overall hair density often decreases gradually with age.

This is biologically different from a 22-year-old rapidly developing hereditary pattern hair loss.

Can More Than One Cause Happen at the Same Time?

Absolutely.

This is extremely important.

Someone may already have mild genetic pattern hair loss and then experience:

genetic thinning

severe illness

↓

telogen effluvium

The sudden shedding can make previously subtle genetic thinning dramatically more visible.

Likewise:

PCOS + iron deficiency + female-pattern hair loss

may coexist.

This is why online photographs and single blood tests do not always provide the full answer.

Does Dandruff Cause Baldness?

Ordinary dandruff itself is not the typical cause of permanent pattern baldness.

However, severe scalp inflammation, scratching, secondary infection, psoriasis, or significant seborrheic dermatitis can contribute to temporary shedding or hair breakage.

Persistent:

• redness,
• severe scaling,
• pustules,
• bleeding,
• pain,

deserves medical evaluation.

Does Shampoo Cause Hair Loss?

Usually, shampoo simply reveals hairs that were already ready to shed.

During washing, many resting hairs are released simultaneously.

This creates the impression:

“My shampoo caused all this hair to fall.”

But avoiding shampoo does not prevent genetic hair loss or telogen effluvium.

Very harsh products can irritate the scalp or damage the hair shaft, but routine appropriate shampooing does not normally destroy healthy follicles.

Does Wearing a Cap Cause Baldness?

Ordinary loose hats and caps do not cause male-pattern baldness.

Genetic pattern loss occurs inside the follicle through biological mechanisms—not because the scalp “cannot breathe.”

Hair follicles obtain oxygen and nutrients through the bloodstream, not directly from the surrounding air.

However, repetitive severe friction or tension from particular headwear could damage hair in localized areas.

Does Poor Blood Circulation Cause Baldness?

Hair follicles require a blood supply.

But ordinary male-pattern baldness is not simply caused by “bad scalp circulation.”

If insufficient circulation were the main problem, scalp massage alone would cure pattern baldness.

It does not.

Androgen sensitivity, genetics, follicle biology, immune signalling, inflammation and other mechanisms are much more important.

How Doctors Work Out the Cause

Hair loss diagnosis often begins with something surprisingly powerful:

a detailed history and examination.

A dermatologist may ask:

• When did shedding begin?
• Sudden or gradual?
• Whole scalp or one area?
• Any illness 2–4 months earlier?
• Recent fever?
• Surgery?
• Weight loss?
• New diet?
• New medications?
• Pregnancy?
• Menstrual changes?
• Family history?
• Tight hairstyles?
• Hair treatments?
• Scalp itching or pain?

They may then examine the scalp using trichoscopy/dermoscopy, which magnifies follicles and hair shafts.

Depending on the suspected cause, testing might include:

• complete blood count,
• ferritin/iron studies,
• thyroid testing,
• selected nutritional tests,
• hormonal investigations when clinically indicated,
• fungal testing,
• scalp biopsy for suspected scarring alopecia.

Not everyone needs every test.

Testing should be based on the history and pattern of loss.

Which Hair Loss Usually Grows Back?

A simplified overview:

When Hair Loss Should Be Checked Quickly

Arrange medical evaluation particularly if you notice:

• sudden severe shedding,
• rapidly expanding bald patches,
• smooth circular bald spots,
• eyebrow or eyelash loss,
• significant scalp pain,
• burning,
• pus or pustules,
• heavy crusting,
• bleeding,
• shiny areas where follicle openings disappear,
• hair loss in a child,
• unexplained weight change,
• major fatigue,
• menstrual/hormonal abnormalities,
• signs of systemic illness.

Scarring alopecia deserves particular attention because treatment may prevent additional permanent follicle destruction.

Don’t Start With Hair Gummies—Start With the Cause

Modern hair-loss marketing makes the solution look simple:

Hair falling? → Take biotin.

Reality is far more complicated.

Hair loss might be caused by:

Genetics

or

DHT sensitivity

or

Iron deficiency

or

Thyroid disease

or

Rapid weight loss

or

Autoimmune disease

or

A fungal infection

or

Medication

or

Scalp inflammation

or

Physical traction

or

several of them simultaneously.

No single shampoo, vitamin, oil, laser or medication appropriately treats all of those conditions.

The Most Important Principle in Hair Loss

Think of hair loss as a warning light.

If the warning light appears in a car, replacing the bulb doesn’t repair the engine.

Similarly:

Hair loss is a symptom. The first job is finding its cause.

For some people, the answer is genetic.

For others, it is temporary physiological stress.

For others, it is nutrition.

For others, it is hormonal.

And for a smaller but important group, inflammation is actively destroying follicles and needs prompt treatment.

That is why the best modern approach is:

Identify the pattern

↓

Find the mechanism

↓

Treat the underlying cause

↓

Protect surviving follicles

↓

Support regrowth where biologically possible

Final Takeaway

There isn’t one reason for hair fall.

There are dozens.

But most cases can be organized into a few major categories:

1. Genetic and hormonal hair loss
2. Temporary stress-related shedding
3. Nutritional deficiencies
4. Endocrine and hormonal disorders
5. Autoimmune disease
6. Scalp infections and inflammation
7. Scarring alopecia
8. Physical and chemical hair damage
9. Medication or cancer-treatment related loss
10. Systemic disease, toxins and other uncommon causes

And perhaps the most important message is:

Early hair loss does not necessarily mean permanent baldness.

Many causes are reversible.

Even genetic hair loss can frequently be slowed considerably when recognized early.

But follicles destroyed by advanced scarring cannot simply be restarted.

So instead of spending months experimenting with oils, supplements and shampoos, someone experiencing persistent or progressive hair loss should first determine what type of hair loss is actually occurring.

That single decision can make more difference than almost any product sitting on a pharmacy shelf.

Medical Evidence Note

This article reflects dermatology guidance and contemporary research available through 2026. The American Academy of Dermatology recognizes hereditary hair loss, alopecia areata, illness-related shedding, hormonal disorders, nutritional deficiencies, medication effects, scalp infections, traction, hair-care damage and scarring alopecias among important causes of hair loss.

Recent systematic reviews also support associations between hair disorders and nutritional factors including iron, vitamin D and several micronutrients, while emphasizing that evidence is inconsistent for some nutrients and that indiscriminate supplementation is not justified.

Disclaimer

This article is for educational purposes and is not a substitute for medical diagnosis. Persistent, sudden, patchy, painful, inflammatory or rapidly progressive hair loss should be evaluated by a qualified dermatologist or healthcare professional.

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