Symptoms of PCOS: Hormonal Signs Women Should Know

The symptoms of PCOS affect far more than just the ovaries — this complex hormonal condition disrupts menstrual cycles, triggers visible skin and hair changes, complicates fertility, increases long-term metabolic and cardiovascular risk, and takes a significant toll on mental health. Polycystic ovary syndrome affects an estimated 6% to 12% of women of reproductive age in the United States (and higher shares by some international estimates), making it one of the most common endocrine disorders in this population, according to the CDC. Yet a large share of women with PCOS remain undiagnosed — often because their symptoms are dismissed as cosmetic concerns, stress-related irregularities, or simply “normal variation.” Understanding the full symptom picture is essential for early diagnosis and effective long-term management. Our medical conditions guide covers additional conditions worth knowing about.

What Is PCOS?

Polycystic ovary syndrome is a hormonal and metabolic disorder characterized by an imbalance of reproductive hormones, particularly excess androgens (male-type hormones like testosterone and DHEA-S), disrupted ovulation, and frequently insulin resistance. Despite its name, not every woman with PCOS has visible cysts on her ovaries — and having cystic-appearing ovaries on ultrasound does not necessarily mean you have PCOS. The “cysts” in PCOS are actually immature follicles (small fluid-filled sacs containing eggs) that have failed to develop and ovulate normally, remaining arrested at a small size and accumulating along the ovary’s periphery in a characteristic “string of pearls” pattern on ultrasound.

The exact cause of PCOS remains incompletely understood, though research points to a combination of genetic predisposition, insulin resistance, and low-grade chronic inflammation. PCOS runs strongly in families — women with a mother or sister who has the condition face a substantially increased risk of developing it themselves, and both maternal and paternal genetic contributions appear to play a role. The National Institute of Child Health and Human Development recognizes PCOS as both a reproductive and metabolic condition, which is why its effects extend well beyond the ovaries to affect cardiovascular health, glucose metabolism, liver function, and mental health.

Diagnosis in adults follows the internationally accepted Rotterdam criteria, which require the presence of at least two of three features: (1) irregular or absent periods (oligo-ovulation or anovulation), (2) clinical or biochemical signs of excess androgens (hirsutism, acne, elevated testosterone), and (3) polycystic ovarian morphology — historically defined by 12 or more (now often 20 or more, on high-resolution ultrasound) follicles per ovary or ovarian volume greater than 10 mL. Critically, PCOS is a diagnosis of exclusion: other conditions that can mimic it — including thyroid disease, high prolactin (which can be caused by a prolactinoma), non-classic congenital adrenal hyperplasia, Cushing’s syndrome, and androgen-secreting tumors — must be ruled out before the diagnosis is made.

What Changed in the 2023 International Guideline

The most current framework is the 2023 International Evidence-Based Guideline for the Assessment and Management of PCOS, developed with the American Society for Reproductive Medicine, the European Society of Human Reproduction and Embryology, and Monash University. A few practical updates are worth knowing:

• AMH can replace ultrasound in adults. A blood test for anti-Müllerian hormone (AMH), which tends to be elevated in PCOS, can now be used as an alternative to a pelvic ultrasound to help establish polycystic ovarian morphology in adults. This is helpful when a transvaginal ultrasound is not appropriate or available.
• Ultrasound should not be used to diagnose PCOS within about eight years of a girl’s first period, because multifollicular ovaries are common and normal in adolescence.
• Metabolic and cardiovascular risk are emphasized, with recommendations for regular screening of blood glucose, lipids, and blood pressure.
• Mental health and quality of life screening are built into routine care, reflecting the high rates of anxiety, depression, and disordered eating in PCOS.

These refinements do not change the core symptom picture — they mainly make diagnosis more accessible and push care toward the whole-body view of PCOS.

Irregular or Absent Periods

Menstrual irregularity is the single most common reason women with PCOS first seek medical attention, and it is often the symptom that leads to diagnosis. Because PCOS disrupts the normal ovulatory cycle, the predictable monthly pattern of follicle development, ovulation, progesterone production by the corpus luteum, and menstrual shedding breaks down. Without regular ovulation, progesterone levels remain low, and the uterine lining continues to build up under unopposed estrogen stimulation.

The resulting menstrual patterns vary widely among PCOS patients. Some women have infrequent periods — fewer than eight or nine cycles per year — with intervals of 35 to 90 days or longer between bleeds (oligomenorrhea). Others lose their periods entirely for months at a time (amenorrhea). Some experience prolonged, extremely heavy bleeding when periods do occur, because the thickened endometrium sheds unpredictably and in large amounts after extended buildup without progesterone-mediated organization. Still others have relatively regular cycles but are not actually ovulating (anovulatory cycles), which may only be discovered during a fertility evaluation.

These irregular patterns are not just inconvenient — they carry clinical significance. Chronic anovulation without progesterone exposure increases the long-term risk of endometrial hyperplasia (abnormal thickening of the uterine lining) and endometrial cancer, according to the American College of Obstetricians and Gynecologists. This is a central medical reason — beyond symptom relief — that clinicians recommend treatment to induce regular withdrawal bleeding (with hormonal contraceptives or cyclical progestin) for PCOS patients who are not trying to conceive: protecting the endometrium from unopposed estrogen. It is why regular bleeds matter, not just for convenience but for cancer prevention. Any treatment decision, including whether and how to use progestin protection, should be made with a clinician.

Excess Androgen Symptoms

Elevated testosterone, DHEA-S, and other androgens produce visible physical changes that are among the most distressing symptoms of PCOS for many women. The severity of androgen-driven symptoms varies widely — from mild to severe — and does not always correlate with the degree of hormonal elevation on blood work.

Hirsutism (Excess Hair Growth)

Unwanted hair growth in a characteristically male pattern — face (chin, upper lip, sideburns, jawline), chest, abdomen (midline and periumbilical), lower back, and inner thighs — affects a majority of women with PCOS. Hirsutism is often the most psychologically impactful symptom and a frequent driver of both medical visits and cosmetic spending. Severity is graded clinically using the modified Ferriman-Gallwey score, which evaluates hair density across nine body areas. The manifestation ranges from mild peach fuzz or a few coarse chin hairs to thick, dark, coarse hair requiring daily removal. Hirsutism tends to worsen gradually over years if untreated because continued androgen exposure stimulates progressive conversion of fine vellus hairs to thick terminal hairs.

Acne and Oily Skin

Hormonal acne driven by androgen excess typically presents along the jawline, chin, lower cheeks, neck, and upper back — areas with high concentrations of androgen-sensitive sebaceous glands. Unlike typical teenage acne that peaks and resolves, PCOS-related acne persists into the 20s, 30s, and beyond, and often does not respond adequately to standard topical acne treatments because the underlying hormonal driver is not addressed. Oily skin (seborrhea) accompanies the acne, and scalp oiliness may require more frequent washing. Cystic acne — deep, painful, inflammatory nodules — is more common in PCOS than in non-hormonal acne.

Hair Thinning on the Scalp (Androgenic Alopecia)

While androgens stimulate excess body and facial hair growth, they can paradoxically thin hair on the scalp — a frustrating and distressing combination. Female-pattern hair loss in PCOS presents as a gradually widening part line, overall thinning at the crown and top of the scalp, and increased shedding noticed in the shower, on pillowcases, and on hairbrushes. Unlike male-pattern baldness, the frontal hairline is typically preserved. The hair loss is diffuse rather than patchy, and individual hairs become finer and shorter as the miniaturization process progresses. A meaningful minority of PCOS patients experience clinically noticeable scalp hair thinning.

Weight Gain and Metabolic Symptoms

Many women with PCOS are overweight or obese, though it is critically important to understand that PCOS can and does affect women at every body weight — roughly 20% to 30% of PCOS patients are lean or normal weight. Insulin resistance — present in a large share of PCOS patients regardless of weight — drives much of the metabolic dysfunction and contributes to the difficulty many PCOS patients experience with weight management.

Insulin resistance in PCOS means that cells respond poorly to insulin’s signal to absorb glucose, prompting the pancreas to produce ever-higher insulin levels (hyperinsulinemia) to compensate. Elevated insulin levels in turn stimulate the ovaries to produce more androgens, creating a self-reinforcing cycle: insulin resistance drives androgen excess, which worsens metabolic dysfunction, which further elevates insulin. This cycle explains why treatments that improve insulin sensitivity (lifestyle modifications and, when a clinician prescribes them, medications such as metformin, or inositol supplements) can simultaneously improve metabolic markers, androgen levels, menstrual regularity, and fertility.

Weight in PCOS tends to accumulate disproportionately around the abdomen (central or visceral adiposity), which is the fat distribution pattern most strongly associated with cardiovascular risk, insulin resistance, and inflammation. Many women with PCOS report that weight gain seems effortless while weight loss is extraordinarily difficult despite genuine dietary and exercise efforts — this is physiologically real, driven by the hormonal and metabolic disruption the condition creates, and is not a failure of willpower.

Related metabolic features and warning signs include:

• Acanthosis nigricans: Dark, velvety, thickened patches of skin in body folds — the neck (back and sides), armpits, under the breasts, and groin creases are the most common locations. This is a visible external marker of insulin resistance and hyperinsulinemia.
• Elevated fasting insulin and blood sugar: A substantial share of PCOS patients develop prediabetes or type 2 diabetes over time, according to the NICHD. Periodic screening with fasting glucose and hemoglobin A1c (or a two-hour oral glucose tolerance test, which is more sensitive for detecting early dysglycemia in PCOS) is recommended.
• Dyslipidemia: High triglycerides, low HDL cholesterol, and elevated LDL cholesterol — the “metabolic syndrome” lipid pattern — are common and contribute to increased cardiovascular risk.
• Metabolic-associated fatty liver disease (formerly NAFLD): More prevalent in PCOS patients than in the general population, related to insulin resistance and visceral adiposity.
• Elevated blood pressure: Particularly in those with insulin resistance, central obesity, and metabolic syndrome.
• Sleep apnea: More common in PCOS patients than in weight-matched controls, likely related to both weight and androgen effects on airway musculature.

Because these cardiometabolic risks accumulate over decades, the 2023 international guideline recommends that women with PCOS have their weight, blood pressure, blood glucose, and lipids checked regularly — treating PCOS as a lifelong cardiometabolic condition, not only a reproductive one.

Fertility and Reproductive Impact

PCOS is the leading cause of anovulatory infertility in the United States — meaning difficulty conceiving because ovulation does not occur regularly or predictably. However, this emphatically does not mean that pregnancy is impossible with PCOS. Many women with PCOS conceive naturally, particularly those with milder hormonal disruption or those who achieve ovulation through lifestyle modifications (modest weight loss if overweight, exercise, dietary changes).

For women who need medical assistance, first-line ovulation induction with letrozole has a high success rate — the American Society for Reproductive Medicine and the NICHD’s landmark PPCOS II trial demonstrated that letrozole produces higher live birth rates than clomiphene citrate in PCOS patients, and letrozole is now the preferred first-line agent in current guidelines. Clomiphene (Clomid) remains an alternative option. For patients who do not respond to oral medications, injectable gonadotropins or in vitro fertilization (IVF) are effective next steps. The majority of women with PCOS who want to become pregnant can achieve pregnancy with appropriate medical support. Any fertility medication should be prescribed and monitored by a clinician.

Women with PCOS who do become pregnant face higher rates of gestational diabetes, preeclampsia, preterm birth, and cesarean delivery. Careful preconception counseling, metabolic optimization before pregnancy, early glucose tolerance testing, and close prenatal monitoring can meaningfully reduce these risks.

Mental Health and Emotional Impact

The psychological burden of PCOS is substantial, clinically significant, and often underappreciated by healthcare providers. Research demonstrates that women with PCOS have significantly higher rates of depression, anxiety, eating disorders (particularly binge eating disorder), poor body image, and reduced quality of life compared to women without the condition. The 2023 international guideline specifically recommends routine screening for these concerns as part of PCOS care.

The visible symptoms — facial hair, acne, scalp hair thinning, weight gain, and acanthosis nigricans — directly affect body image, self-esteem, and social confidence. The fertility implications add profound emotional weight, particularly for women who desire children. The chronic, incurable nature of the condition and the frustration of difficult weight management contribute to feelings of helplessness.

Importantly, the mental health effects of PCOS are not purely psychological reactions to living with a difficult condition. Hormonal imbalances (elevated androgens, altered estrogen-progesterone ratios), insulin resistance, and chronic low-grade inflammation associated with PCOS may also directly affect mood regulation. Depression and anxiety screening — using validated tools like the PHQ-9 and GAD-7 — should be a routine part of PCOS care, and mental health referral should be available for patients who need it. If you are in crisis or having thoughts of self-harm, call or text 988 to reach the 988 Suicide & Crisis Lifeline.

When to See a Doctor

Talk to your healthcare provider — a gynecologist, reproductive endocrinologist, or endocrinologist — if you experience two or more of the following: irregular periods (fewer than eight or nine per year, cycles longer than 35 days, or absent periods), persistent acne that does not respond to standard over-the-counter or prescription topical treatments, new or worsening unwanted facial or body hair, unexplained weight gain concentrated around the abdomen, dark skin patches in body folds, or difficulty getting pregnant after 12 months of trying (or six months if age 35 or older).

A typical diagnostic workup includes: clinical history and physical examination, and blood work such as total and free testosterone, DHEA-S, 17-hydroxyprogesterone (to exclude congenital adrenal hyperplasia), TSH (to exclude thyroid disease), prolactin, and metabolic tests including fasting glucose, hemoglobin A1c, and a lipid panel. Your clinician may order a transvaginal pelvic ultrasound to assess ovarian morphology and endometrial thickness, or — per the 2023 guideline — may use an AMH blood level as an alternative in adults. The evaluation is comprehensive because PCOS requires meeting specific criteria while excluding the conditions that mimic it.

If you need help finding a specialist experienced in PCOS management — particularly one who takes a holistic approach addressing both the reproductive and metabolic dimensions of the condition — our guide on how to find a PCOS doctor walks you through the process.

Frequently Asked Questions

Can you have PCOS without cysts on your ovaries?

Yes — and this is one of the most common misconceptions about the condition. Under the Rotterdam diagnostic criteria, you can be diagnosed with PCOS if you meet any two of the three criteria: (1) irregular/absent periods, (2) excess androgen signs, (3) polycystic ovaries on ultrasound (or, in adults, an elevated AMH level as an alternative). A woman with irregular periods and elevated testosterone but normal-appearing ovaries meets the diagnostic criteria. Conversely, some women without PCOS have ovaries that appear polycystic on imaging — a notable share of young women have this finding incidentally without having the syndrome.

Does PCOS go away after menopause?

Some hormonal symptoms may improve after menopause as androgen levels naturally decline with age — irregular periods obviously cease, acne may improve, and hirsutism may stabilize or slightly lessen. However, the metabolic consequences of PCOS — insulin resistance, elevated cardiovascular risk, increased diabetes risk, and dyslipidemia — persist throughout life and may actually worsen with age and the additional metabolic challenges of menopause. PCOS is a lifelong condition that requires ongoing metabolic monitoring, cardiovascular risk management, and appropriate screening well beyond reproductive years.

Can thin women have PCOS?

Absolutely. An estimated 20% to 30% of women with PCOS are lean (normal BMI). These women can have the same hormonal abnormalities — elevated testosterone, anovulation, polycystic ovaries — and the same metabolic risks, including insulin resistance, as their higher-weight counterparts. Lean PCOS is sometimes harder to diagnose because both patients and clinicians may not suspect a condition so closely associated with overweight in a thin individual. The same diagnostic criteria apply regardless of body weight, and lean PCOS patients deserve the same comprehensive metabolic screening and management.

What is the best diet for PCOS?

No single “PCOS diet” works for everyone, but the best evidence supports dietary patterns that improve insulin sensitivity and reduce inflammation. Key principles include emphasizing whole, unprocessed foods; choosing lower glycemic index carbohydrates (whole grains, legumes, vegetables, berries) over high-glycemic refined carbohydrates (white bread, sugary drinks, processed snacks); including adequate protein at every meal; incorporating anti-inflammatory fats (olive oil, nuts, fatty fish); and maintaining a moderate caloric balance. Multiple clinical guidelines, echoed by the NIH, note that even modest weight loss of 5% to 10% of body weight — if overweight — can meaningfully improve ovulation rates, reduce androgen levels, enhance insulin sensitivity, and improve fertility. A registered dietitian experienced in PCOS is highly recommended for personalized guidance.

Does birth control help PCOS symptoms?

Combined hormonal contraceptives are a first-line pharmacological treatment for managing several PCOS symptoms simultaneously. They regulate menstrual cycles and protect the endometrium from hyperplasia, suppress ovarian androgen production, increase sex hormone-binding globulin (SHBG) to lower free testosterone, improve acne and slow hirsutism progression, and provide reliable contraception. However, they do not address the underlying insulin resistance, metabolic dysfunction, or long-term cardiovascular risk — they manage symptoms without treating root causes. A comprehensive PCOS plan typically combines hormonal therapy with lifestyle modifications and, when a clinician judges it appropriate, insulin-sensitizing medication. Because the right choice depends on your health history and goals, treatment should be individualized with your clinician rather than self-started.

How is AMH used in PCOS now?

Under the 2023 international guideline, a blood anti-Müllerian hormone (AMH) level can be used in adults as an alternative to a pelvic ultrasound to help establish polycystic ovarian morphology, since AMH tends to be higher in PCOS. It is a helpful option when ultrasound is not suitable or available, but it is not a stand-alone test — it is interpreted alongside your periods, androgen signs, and the exclusion of other conditions. AMH is not recommended for diagnosing PCOS in adolescents.

What to Do Next

PCOS is a complex condition with far-reaching effects, but it is eminently manageable with the right medical team, accurate diagnosis, and a proactive, multi-pronged approach. If the symptoms in this article resonate with your experience, bring a detailed symptom log to your next doctor’s appointment — include menstrual cycle dates and patterns over the past year, photos documenting skin changes (acne, hirsutism, acanthosis nigricans), weight trends, and a comprehensive list of your concerns including any mental health symptoms. Early diagnosis opens the door to treatments that improve your quality of life now and meaningfully reduce your risk of diabetes, cardiovascular disease, and endometrial cancer in the decades to come. You do not have to accept irregular periods, persistent acne, unexplained weight gain, or unwanted hair growth as “just the way you are” — they may be signs of a treatable hormonal condition that responds to evidence-based management.

Sources

• 2023 International Evidence-Based Guideline for the Assessment and Management of PCOS (ASRM / ESHRE / Monash University)
• Centers for Disease Control and Prevention — PCOS
• Eunice Kennedy Shriver National Institute of Child Health and Human Development — PCOS
• American College of Obstetricians and Gynecologists — Polycystic Ovary Syndrome
• Office on Women’s Health — Polycystic ovary syndrome