Hormones + Hair Loss: What Is Your Hair Trying to Tell You?

You notice more hair in the shower.

Then more in your brush.

Your ponytail feels smaller. Your part looks a little wider. Maybe your hairline looks different in photos. And eventually someone says:

“It’s probably your hormones.”

Maybe. But that sentence doesn’t actually tell us very much.

Hormones absolutely influence the hair growth cycle, follicle activity, and how certain types of hair loss present. Pregnancy, postpartum changes, perimenopause, menopause, thyroid dysfunction, PCOS and changes in androgen activity can all affect the hair.

But here is the part I want you to remember: Hair loss is not automatically proof of a hormonal imbalance. And being told that your hair loss is “hormonal” isn’t really a diagnosis.

We still need to ask: What changed? When did it change? What pattern are we seeing? And what else was happening in your body at the time?

Because hair doesn’t exist in isolation.

First: Hormones Don’t Work Alone

One of the biggest mistakes we make when talking about hair loss is trying to find the one thing responsible for it.

• Estrogen.

• Testosterone.

• Cortisol.

• Thyroid.

• Iron.

• Stress.

• Genetics.

• Nutrition.

Pick your villain.

Unfortunately, the body isn’t quite that tidy.

Hair follicles exist within a much larger biological environment. Hormonal signalling interacts with genetics, nutrition, inflammation, medications, illness, metabolic health, stress physiology, age and other factors.

That means two people can experience a similar hormonal transition and have completely different changes in their hair.​

One may experience temporary shedding. Another may begin noticing progressive thinning. Someone else may experience both. This is why understanding the pattern and timeline matters so much.

The Hair Growth Cycle Matters

Before we talk about individual hormones, we need to understand one important thing:

Your hair is constantly cycling. Hair follicles move through different phases, including:

• Anagen is the growing phase, when the follicle is actively making a hair fibre.

• Catagen is the transitional phase. During this time, growth slows and the follicle starts to change.

• Telogen is the resting phase. The hair stays in the follicle but is not growing anymore.

• Exogen is the shedding phase, when the hair is released.

This cycle is important because what you see happening to your hair today may have been influenced by something that happened months ago.

Telogen effluvium, for example, commonly becomes noticeable a few months after a triggering event. That delay is one reason hair loss can be so confusing. You may be looking at your shampoo, your diet or something you did last week when the more useful question may be:

What was happening two, three or four months ago?

Estrogen + Hair

Estrogen is one of the hormones most commonly associated with changes in women’s hair.

During pregnancy, many women notice that their hair appears fuller or thicker. Pregnancy can increase the proportion of follicles remaining within the growing phase of the hair cycle.

Then childbirth happens.

Estrogen levels fall.

And several months later, suddenly it can feel as though the hair is falling out everywhere.

This is commonly called postpartum hair loss, although technically what many women experience is postpartum telogen effluvium, excessive shedding related to changes in the hair cycle following pregnancy.

It can look dramatic. The shower drain can look terrifying. I know I have been there myself.

But in many cases, postpartum shedding is temporary, and hair density gradually recovers.

The important word there is many.

Because pregnancy can also reveal hair loss that was already developing underneath the temporary fullness.

Someone may experience postpartum telogen effluvium while also having early female pattern hair loss. Both can exist at the same time. And that is exactly why I don’t like reducing everything to: “It’s postpartum. It’ll grow back.” Sometimes it will. Sometimes there is more to investigate.​

Perimenopause + Menopause

Another major hormonal transition happens during perimenopause and menopause.

Estrogen and other reproductive hormones change during this stage of life, while the relative influence of androgens may become more noticeable.

For some women, this coincides with changes such as:

• reduced overall density

• a widening part

• a smaller ponytail

• increased visibility of the scalp

• changes around the temples or frontal hairline

• changes in hair texture or fibre quality

Female pattern hair loss also becomes more common with age and is frequently seen during midlife. But menopause itself should not automatically receive all the blame. If someone begins experiencing hair loss during perimenopause, I still want to know:

• Is this diffuse shedding?

• Is there progressive miniaturization?

• Has the hair diameter changed?

• Is the part widening?

• Is there inflammation?

• What is happening at the frontal hairline?

• Has thyroid function been assessed?

• Have there been nutritional changes?

• New medications?

• Significant illness?

• Weight changes?

• Major stress?

Again: Hormones may be part of the picture, but not the entire picture.

Androgens, Testosterone + DHT

This is where conversations about hormones and hair often get oversimplified.

Androgens are a group of hormones that include testosterone and dihydrotestosterone, better known as DHT. DHT can influence genetically susceptible hair follicles.

In androgenetic alopecia, also known as male or female pattern hair loss, certain follicles slowly get smaller through a process called miniaturization.

The hairs they produce can become:

• shorter,

• finer,

• and less substantial over time.

• Eventually, scalp density becomes visibly reduced.

But it’s important to know that you don’t always need high testosterone levels to have androgenetic hair loss.

The sensitivity of the follicle matters. Genetics matter. The local activity within the follicle matters. This is why simply ordering a testosterone test and seeing a “normal” result doesn’t automatically rule out androgen-related pattern hair loss. We need to look at the hair itself.

PCOS + Hair Loss

Polycystic ovary syndrome, or PCOS, is another condition where hormones and hair can intersect.

PCOS can involve increased androgen activity and may be associated with symptoms such as:

• irregular menstrual cycles

• acne

• increased facial or body hair

• changes in scalp hair density

• difficulty managing weight

• metabolic changes

Some people with PCOS develop pattern hair loss.

Others don’t.

And scalp hair loss alone isn’t enough to diagnose PCOS. When hair changes occur alongside menstrual changes, acne, increased facial hair or other symptoms suggestive of hormonal changes, that is information worth bringing to your healthcare provider. Hair can provide clues. It shouldn’t be asked to make the diagnosis by itself.

Thyroid Hormones + Hair

The thyroid deserves its own conversation because both underactive and overactive thyroid function can affect the hair. Thyroid-related changes may include increased shedding, diffuse thinning and changes in the texture or quality of the hair.

The hair may become:

• dry,

• coarse,

• brittle,

• fine,

• or more prone to shedding depending on what is happening.

But again, hair symptoms alone aren’t enough to diagnose thyroid disease. If your pattern, symptoms, or health history point to a thyroid issue, it’s important to get a medical check and the right lab tests. This is where trichologists and doctors should work together. My job isn’t to diagnose thyroid disease, but to notice when your hair might be telling us something that needs a closer look.

What About Cortisol?

Ah, cortisol.

The hormone the internet has collectively decided is responsible for approximately everything.

Cortisol is essential to human physiology. We need it.

• The more useful conversation isn’t: “Is cortisol bad?”

• It is: “What has the body been experiencing?”

Significant psychological stress, illness, surgery, fever, major weight loss, nutritional changes and other physiological stressors can disrupt the normal hair-growth cycle and contribute to telogen effluvium. And sometimes several things happen together.

• Maybe you were under enormous emotional stress.

• But you were also sleeping poorly.

• Eating differently.

• Losing weight.

• Recovering from an illness.

• Starting medication.

• Moving through perimenopause.

Your hair doesn’t sort these experiences into separate boxes, and we shouldn’t either.

Insulin + Metabolic Health

Metabolic health can also intersect with hormonal health.

Insulin resistance, for example, is commonly associated with PCOS and can exist within a larger hormonal and metabolic picture. That doesn’t mean insulin resistance automatically causes someone’s hair loss. It means that when we are investigating changes in the hair, understanding the person’s broader health history may provide useful context. This is one reason I ask a lot of questions during a trichology assessment.

Sometimes seemingly unrelated pieces become very relevant once we put them side by side.

Birth Control + Hormonal Medications

Starting, stopping or changing hormonal contraception can sometimes coincide with changes in hair shedding.

Timing matters, a change today may not become visible in the hair immediately. Always discuss medication-related hair changes with the healthcare professional managing that medication. Please don’t stop prescribed medication because your hair started shedding without speaking with your provider.

We investigate first.

Then we make informed decisions.​

Hormonal Hair Loss Isn’t One Type of Hair Loss

This may be the most important part of this entire article. There isn’t one diagnosis called Hormonal Hair Loss.

Hormonal changes can contribute to or interact with several different hair-loss presentations.

For example, we might be looking at:

• Telogen Effluvium- Diffuse excessive shedding that can occur following physiological or psychological stressors, hormonal transitions, illness and other triggers.

• Androgenetic Alopecia / Female Pattern Hair Loss- Progressive miniaturization of genetically susceptible follicles.

• Postpartum Telogen Effluvium- Temporary increased shedding following pregnancy and childbirth.

• Hair loss associated with thyroid dysfunction- which requires appropriate medical investigation and management.

• And sometimes:

  • More than one condition is happening at once.

  • That last part matters enormously.

So How Do We Know What’s Actually Happening?

We investigate. Not just the hormones. The whole pattern.

When I assess hair loss, I am looking at several layers.

The Hair Loss Pattern

• Where is density changing?

• Is the loss diffuse?

• Is the part widening?

• Are the temples changing?

• Is the frontal hairline changing?

• Are there distinct patches?

The Hair Follicles

Using trichoscopy, we can examine the scalp and follicles under magnification.

We may look at things such as:

• hair density

• hair diameter

• variation between hair diameters

• follicular distribution

• miniaturization patterns

• scalp condition

• signs of inflammation

• breakage

• changes over time

Things to consider over time:

• When did the shedding begin?

• What happened approximately two to four months before you noticed it?

• Pregnancy?

• Illness?

• Surgery?

• Major emotional stress?

• Weight loss?

• Dietary change?

• Medication?

• Hormonal contraception?

• Menopause?

• Something else?

Your Health History

This is where we begin connecting the dots because the scalp doesn’t live separately from the rest of you.

Sometimes Testing Is Appropriate

Depending on the pattern and your history, further medical investigation may be appropriate.

That may include discussing laboratory testing with your physician or another qualified healthcare provider.

Testing should be based on your specific situation, not just ordering every possible hormone test and hoping for answers. More tests don’t always mean better results.

The right question should guide the right investigation.

Your Hair Is Data, Not a Diagnosis

This is how I want you to begin thinking about your hair.

Your hair is information. Changes in shedding, density, diameter, growth or fibre quality can tell us that something has changed. Our job is to determine what that change means. Sometimes hormones are a significant part of the answer. Sometimes they’re one piece.

Often the timing makes hormones look guilty when another factor is actually driving the change. And sometimes several things are happening simultaneously. That is why root-cause hair assessment isn’t about finding one fashionable explanation. It’s about learning how to read the pattern.

Stop Guessing. Start Observing.

If you’re experiencing hair loss, excessive shedding or changes in density, you don’t necessarily need another supplement, serum or shampoo. You need a clearer understanding of what type of hair change you’re actually experiencing. That starts with observation:

• Pattern.

• Timeline.

• Scalp.

• Follicle.

• Hair fibre.

• Health history.

• Potential triggers.

And when appropriate, collaboration with your physician, dermatologist or another healthcare professionalOnce we know what we’re seeing, we can make better choices about what to do next. Understand the follicle. Protect the hair fibre. Support the person, because it’s never just about hair.ir.

Ready to Understand What’s Happening With Your Hair?

My Comprehensive Trichology Assessment takes a deeper look at your hair loss, scalp health, hair-growth patterns, hair fibre, health history and potential contributing factors.

The goal isn’t to hand you another generic hair-loss routine. It’s to understand your individual pattern, identify what may require further investigation, and build a strategy tailored to you.

Book a Comprehensive Trichology Assessment

Available in person and virtually.

Educational Disclaimer

This article is intended for general educational purposes and does not provide medical diagnosis or treatment. Hair loss can have many causes, including medical conditions that require assessment by a physician or dermatologist. A trichology assessment can help identify patterns and potential contributing factors and determine when referral to an appropriate healthcare professional may be warranted.

Start With Understanding

If you're experiencing irregular areas of hair loss, broken hairs or changes in density and aren't sure what's causing them, you don't need to diagnose yourself from photographs online. In fact, I'd rather you didn't.

Start with understanding what you're seeing. Look at the pattern and the timeline. Examine the hair and scalp. Ask better questions. And when the evidence points beyond the hair itself, bring the appropriate professionals into the conversation.

Hair loss tells us that something has changed, but it doesn't always tell us exactly what changed. That's where observation, assessment and the right questions become so important.

Because before we can decide what to do about hair loss, we need to understand what we're actually looking at.

Keep Exploring Hair Loss

Trichotillomania is only one possible explanation for hair loss. Different hair-loss conditions can look surprisingly similar from the bathroom mirror, and sometimes more than one thing is happening at the same time.

→ Explore All Types of Hair Loss

You can learn more about androgenetic alopecia, telogen effluvium, alopecia areata, traction alopecia, scarring alopecia, hormonal influences, nutritional factors and other patterns in my Hair Loss Library.

Concerned About Your Own Hair?

You don't need to determine what type of hair loss you have before reaching out. That's part of what an assessment is designed to help us understand.

My Comprehensive Trichology Assessment looks at the pattern and timeline of your hair loss, along with your scalp, hair growth, hair fibre, hair-care practices, and relevant context. The goal isn't to squeeze you into a one-size-fits-all answer. It's to understand the bigger picture, identify what may deserve further investigation and determine the most appropriate next steps for you.

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Related Reading

• Androgenetic Alopecia + Pattern Hair Loss

• Hormones + Hair Loss

• Nutrition + Hair Health

• Telogen Effluvium

• Trichoscopy

Educational information only. This article is not intended to diagnose or treat trichotillomania or any other medical or mental health condition. If you're experiencing recurrent hair pulling that is causing hair loss, distress or interfering with your daily life, speak with an appropriate healthcare or mental health professional.