PCOS Hair Loss: Why It Happens and What to Know
For many women with PCOS, now officially renamed Polyendocrine Metabolic Ovarian Syndrome (PMOS), symptoms such as irregular periods, acne, and weight changes are well-known. However, one of the most distressing and often overlooked symptoms is hair loss.
Seeing more hair in the shower drain, noticing a widening part, or feeling like your ponytail is becoming thinner can have a significant impact on confidence and quality of life. While hair loss can occur for many reasons, PMOS-related hair loss has unique underlying drivers that are important to understand.
The good news? Hair loss associated with PMOS is often manageable, particularly when the underlying hormonal and metabolic factors are addressed.
What Does PMOS Hair Loss Look Like?
Hair loss in PMOS is typically referred to as female pattern hair loss or androgenetic alopecia. Unlike other forms of hair loss that may cause sudden shedding or distinct bald patches, PMOS -related hair loss usually develops gradually over time.
Common signs include:
Thinning at the crown or top of the scalp
A widening part line
Reduced hair density overall
A smaller or thinner ponytail
Increased visibility of the scalp
Excessive shedding during brushing or washing
Many women notice a frustrating combination of symptoms: unwanted hair growth on the face or body (hirsutism) while simultaneously experiencing hair thinning on the scalp.
This seemingly contradictory pattern is largely explained by the hormonal changes associated with PMOS.
Why Does PMOS Cause Hair Loss?
ELEVATED ANDROGENS
One of the hallmark features of PMOS is hyperandrogenism, meaning higher-than-normal levels of androgens such as testosterone.
Although androgens are often thought of as "male hormones," women naturally produce them as well. In PMOS, however, androgen levels may be elevated enough to affect hair follicles.
Here's what happens: the body converts testosterone into a stronger form called DHT. DHT then attaches to the follicle and, over time, causes it to:
Shrink; producing thinner, weaker hairs with each growth cycle
Spend less time in the growth phase
Eventually stop producing visible hair altogether
Think of it like a plant slowly getting less water. The hair doesn't disappear overnight but rather gradually becomes finer and shorter until it's barely visible. Over time, this results in progressively thinner hair and reduced scalp coverage.
In women with PMOS and confirmed elevated androgens, this hormone-driven mechanism is particularly relevant. However, it is worth noting that female pattern hair loss can also occur in women without measurably high androgens, suggesting additional factors including how the body processes estrogen at the scalp level, may also play a role.
INSULIN RESISTANCE
Insulin resistance is increasingly recognized as a major contributor to many PCOS symptoms. While commonly cited estimates suggest it affects 50–75% of women with PCOS, these figures come from standard blood tests that may underestimate the true picture. More precise research methods suggest the actual prevalence is up to 75% in lean women and over 90% in those with a higher BMI.
When cells become less responsive to insulin, the body compensates by producing more of it. Elevated insulin levels can stimulate the ovaries to produce additional androgens, further contributing to hair loss.
Insulin may also reduce production of sex hormone-binding globulin (SHBG), which is a hormone that binds to testosterone in the bloodstream and keeps it inactive. When insulin is high, there's less SHBG, meaning more free, active testosterone is available to act on hair follicles.
This is one reason why addressing insulin resistance is often a key component of managing PCOS-related hair loss.
CHRONIC INFLAMMATION
Research suggests that many women with PMOS experience low-grade chronic inflammation, which interacts with insulin resistance and elevated androgens. While inflammation is not established as a direct cause of hair loss in PMOS, it can contribute to the broader hormonal and metabolic environment that worsens androgen-driven symptoms.
NUTRIENT DEFICIENCIES
People with PMOS are more likely to have certain nutrient deficiencies, which may contribute to hair thinning and shedding.
Common deficiencies seen in women with PMOS include:
Iron deficiency or low ferritin (your body's iron stores)
Vitamin D deficiency
Vitamin B12 deficiency
Zinc deficiency
Hair follicles are among the most metabolically active tissues in the body and require an adequate supply of nutrients to support healthy growth. Evidence linking certain nutrient deficiencies to hair loss continues to grow, and supplementation should be individualized based on testing and guided by your naturopathic doctor.
Is It Really PMOS Causing the Hair Loss?
It's worth noting that stress doesn't always push hormones in the direction of androgen excess. In some cases, particularly when stress is combined with energy deficit, excessive exercise, or significant weight loss, it can lead to functional hypothalamic amenorrhea (FHA). This is a condition where periods stop altogether due to suppression of the reproductive axis.
FHA and PCOS are the two most common causes of secondary amenorrhea, and distinguishing between them is clinically important because the treatment approaches are completely different. FHA is characterized by low estrogen, low LH, and often low or normal androgens, which is essentially the opposite hormonal picture from classic PCOS.
Interestingly, research shows that up to 46% of women with FHA have polycystic ovarian morphology on ultrasound, which can lead to misdiagnosis if clinicians aren't looking at the full picture. The key differentiators include BMI (FHA is uncommon in women with BMI > 24), estradiol levels (low in FHA, normal or high in PCOS), and LH levels (low in FHA, often elevated in PCOS).
What Blood Work May Be Helpful?
Laboratory testing can help identify the hormonal, metabolic, nutritional, and other factors that may be contributing to hair loss. Depending on your symptoms and medical history, your naturopathic doctor may recommend testing that includes:
Hormonal markers: Total and free testosterone, DHEA-S, and other hormones as clinically indicated.
Metabolic markers: Fasting glucose, fasting insulin, hemoglobin A1c, and a lipid panel to assess blood sugar regulation and metabolic health.
Nutritional markers: Ferritin, vitamin D, and vitamin B12 to identify deficiencies that may contribute to hair thinning.
Complete blood count (CBC): To screen for anemia and other blood-related abnormalities that may impact hair growth.
Additional testing: Thyroid function (TSH and thyroid hormones) and inflammatory markers, such as C-reactive protein (CRP), when clinically appropriate.
The goal is not simply to confirm hair loss but to understand why it is occurring. Identifying and addressing these underlying factors can help guide a more targeted treatment plan rather than relying on a one-size-fits-all approach.
Can Hair Grow Back?
One of the most common questions women ask is whether PMOS-related hair loss is reversible. The answer depends on several factors, including how long the hair loss has been occurring, how much the follicles have shrunk, and whether underlying hormonal drivers are addressed.
It is important to set realistic expectations: hair loss is considered one of the most challenging PMOS symptoms to manage. Follicles that have been shrinking for many years may be harder to recover. However, many women can slow progression, improve density, and stimulate regrowth when the root causes are identified and addressed early.
Hair grows slowly, and meaningful changes often take several months. Most approaches require at least 3–6 months before noticeable improvements occur.
What Can Be Done?
Managing PMOS-related hair loss is most effective when it focuses on the root causes rather than the symptom alone.
Understanding and Addressing Insulin Resistance
Because insulin resistance contributes to androgen production, improving insulin sensitivity may indirectly support hair health.
Strategies may include:
Regular physical activity
Adequate protein intake
High-fibre meals
Managing blood sugar fluctuations
Weight management where appropriate
Research has shown that improving insulin sensitivity can help reduce circulating androgen levels in women with PMOS.
Identifying and Addressing Hormonal Imbalances
Understanding your specific hormonal picture through comprehensive lab work is an important first step. Elevated androgens and insulin resistance all interact, and knowing which factors are at play helps guide a more targeted approach.
Working with a naturopathic doctor who understands the hormonal complexity of PMOS can make a significant difference in outcomes.
Optimizing Nutrient Status
Correcting deficiencies may improve hair growth potential and reduce shedding.
Particular attention is often paid to:
Ferritin (iron stores)
Vitamin D
Zinc
Vitamin B12
Supplementation should be based on laboratory findings whenever possible.
Stress Management
Chronic stress can influence hormones and contribute to increased shedding through a process called telogen effluvium, which is when stress pushes more hair follicles into their "resting" phase at once, leading to noticeable shedding weeks later.
While stress management alone may not reverse PMOS-related hair loss, it can be an important supportive strategy.
Helpful approaches may include:
Regular exercise
Meditation or mindfulness practices
Adequate sleep
Nervous system regulation techniques
When Should You Seek Help?
It is worth seeking support if you notice:
Progressive thinning of the scalp
A widening part
Significant hair shedding
New symptoms of PMOS such as irregular periods, acne, or excess facial hair
Hair loss that is affecting your confidence or emotional wellbeing
The earlier underlying causes are identified, the greater the opportunity to preserve hair density and support regrowth.
The Bottom Line
PMOS-related hair loss is common, but that does not mean it should be ignored or accepted as inevitable.
In many cases, hair thinning is driven by a combination of elevated androgens, insulin resistance, and nutrient deficiencies. Understanding these root causes is often the first step toward improving hair health.
While hair regrowth takes time, identifying and addressing the hormonal and metabolic drivers of PMOS can help slow progression, support healthier hair growth, and improve overall wellbeing.
If you are experiencing hair loss and suspect PMOS may be contributing, a comprehensive assessment can help identify the factors involved and guide a personalized plan forward.
Ready to make a change?
Book a complimentary 15-minute consultation to learn how naturopathic care can help you address your symptoms with confidence.
Be well,
Dr. Simone Pirita, ND
Frequently Asked Questions About PCOS/PMOS Hair Loss
Can PCOS cause hair loss even if my testosterone is normal?
Yes. Female pattern hair loss can occur even when blood androgen levels are within the normal range. Hormone sensitivity at the hair follicle and other factors may also contribute, which is why a broader assessment can be helpful.
What does PCOS hair loss look like?
PCOS-related hair loss often appears as gradual thinning at the crown or top of the scalp, a widening part, reduced overall density, or a thinner ponytail rather than distinct bald patches.
What blood tests should I ask about for PCOS hair loss?
Testing will depend on your individual symptoms and history, but may include androgen markers such as testosterone and DHEA-S, metabolic markers such as fasting glucose and insulin, ferritin and other nutrient markers, a CBC, and thyroid testing.
Can hair grow back after PCOS-related hair loss?
Regrowth may be possible, particularly when contributing factors are identified and addressed early. Results vary depending on how long thinning has been occurring and the degree of follicle miniaturization. Hair growth is slow, so noticeable changes often take several months.
Can insulin resistance contribute to PCOS hair loss?
It can. Higher insulin levels can stimulate androgen production and reduce SHBG, resulting in more free testosterone being available to act on hair follicles. Addressing insulin resistance may therefore be an important part of managing PCOS-related symptoms.
Medically reviewed by The Clara Clinic