If low testosterone is the quiet one, high testosterone is the hormone that tends to make itself visible, on your skin, in your hair, and in your cycle. It's one of the most common hormonal patterns in women of reproductive age, largely because of how often PCOS appears. Understanding the signs is the first step to getting the right help, because high testosterone is genuinely treatable once you know what's driving it.

The signs of high testosterone in women

Because testosterone influences your oil glands, hair follicles and cycle, too much of it shows up in fairly recognisable ways:

Irregular or absent periods are one of the most important signs, as excess testosterone disrupts ovulation. Excess facial and body hair (called hirsutism) — on the chin, upper lip, chest or stomach — is a classic sign. So are acne and oily skin, and thinning hair on the scalp (in a male-pattern way). Less commonly, very high levels can cause a deeper voice or noticeably increased muscle mass. Not everyone has all of these, and severity varies a lot.

Sources: Testosterone: Function, Levels & Imbalances — Cleveland Clinic; Normal Testosterone and Estrogen Levels in Women — WebMD. High testosterone can cause irregular or absent periods and excess body and facial hair.

If acne is your main concern, you may also find our piece on hormonal acne helpful, since the androgen-oil connection is the same mechanism.

What are the signs of high testosterone in women?
Signs of high testosterone in women can include irregular or absent periods, excess facial and body hair (hirsutism), acne, oily skin, thinning hair on the scalp, and in some cases a deeper voice or increased muscle mass. Many of these signs relate to the skin and hair because testosterone influences oil glands and hair follicles. High testosterone is most commonly linked to PCOS.

What causes high testosterone — PCOS and beyond

By far the most common cause of high testosterone in women is PCOS (polycystic ovary syndrome), in which the ovaries produce excess androgens. PCOS is very common and very manageable, but it does need proper diagnosis. A key driver in many cases is insulin resistance: when insulin is high, it can push the ovaries to make more testosterone, which is why blood-sugar and lifestyle factors matter in PCOS.

Less common causes include congenital adrenal hyperplasia (a genetic condition affecting adrenal enzymes) and, rarely, ovarian or adrenal tumours that overproduce testosterone. These are uncommon, but they're part of why a sudden or severe rise in symptoms should always be checked promptly.

Source: Testosterone: What It Is, Function, Levels & Imbalances — Cleveland Clinic. PCOS is the most common cause of high testosterone; rarer causes include congenital adrenal hyperplasia and tumours.

High testosterone usually points to PCOS, which is common and very manageable. The symptoms are a signal worth following, not a verdict to fear.
What causes high testosterone in women?
The most common cause of high testosterone in women is polycystic ovary syndrome (PCOS), in which the ovaries produce excess androgens. Other less common causes include congenital adrenal hyperplasia, ovarian or adrenal tumours, and insulin resistance, which can drive the ovaries to make more testosterone. A doctor can identify the underlying cause through examination, blood tests and sometimes imaging.

High testosterone and your periods

One of the clearest effects of high testosterone is on your cycle. Elevated androgens interfere with ovulation, and without regular ovulation, periods become irregular, infrequent or absent. This is a hallmark of PCOS. The encouraging part: because the periods are disrupted by the hormone imbalance, addressing the underlying cause (often including insulin resistance) can help restore more regular cycles over time. One nutrient-related approach that's gained research attention here is inositol, which we cover separately.

Can high testosterone affect my periods?
Yes. High testosterone can interfere with ovulation, which often leads to irregular, infrequent or absent periods. This is one of the hallmark features of PCOS, where elevated androgens disrupt the normal hormonal signals that trigger a regular cycle. Restoring more regular cycles usually involves addressing the underlying cause with a doctor's guidance.

When to see a doctor

It's worth seeing a doctor if you have irregular or absent periods, noticeable excess hair growth, persistent acne, or scalp hair thinning — and you should seek prompt attention for any rapid or severe changes (these are rare but important to rule out). A doctor can test your hormone levels, look for causes like PCOS, and help with both the symptoms and the underlying condition. This matters beyond the visible signs too: PCOS, for instance, has long-term links to metabolic and cardiovascular health, so getting assessed is an investment in your whole wellbeing, not just your skin or cycle.

When should I see a doctor about high testosterone?
See a doctor if you have signs such as irregular or absent periods, noticeable excess hair growth, persistent acne, scalp hair thinning, or any rapid or severe changes, which should always be checked promptly. A doctor can test your hormone levels, look for causes like PCOS, and help with both the symptoms and the underlying condition. Getting assessed also matters for long-term health, since conditions like PCOS affect more than just hormones.

To understand testosterone's healthy role first, see do women produce testosterone, and for the opposite imbalance, low testosterone in women.

About the author

Andreea Mighiu is a women's hormonal health educator and the founder of Zōē. She works alongside medical doctors to translate peer-reviewed research into clear, practical cycle education. She is an educator, not a physician — Zōē's content is designed to inform, not to replace personalised medical advice.

References

1. Testosterone: What It Is, Function, Levels & Imbalances. Cleveland Clinic. my.clevelandclinic.org
2. Normal Testosterone and Estrogen Levels in Women. WebMD. webmd.com

This article is educational and not a substitute for medical advice. If you have signs of high testosterone, please see a doctor for proper testing and diagnosis.