Estrogen is the hormone most associated with being a woman, but most of us never learn just how much it does until it starts to dip. Far beyond the menstrual cycle, estrogen influences your brain, bones, skin, sleep, mood and sexual comfort. So when levels fall, the symptoms can feel scattered and confusing, until you realise they share one root. Let's connect the dots.

The symptoms of low estrogen

Low estrogen tends to show up across several systems at once. The most common signs:

Hot flashes and night sweats are the classic, most recognised symptom, that sudden wave of heat. Vaginal dryness and discomfort during sex are extremely common but under-discussed, because estrogen maintains the lubrication and thickness of vaginal tissue. Irregular or absent periods often signal falling estrogen. And many women experience mood changes, brain fog, sleep problems and low libido. Over the longer term, low estrogen also reduces bone density, which is why it matters for lifelong health, not just comfort.

Sources: Low Estrogen Symptoms, Causes & Treatment — Healthline; What Does Estrogen Do? — Cleveland Clinic; Vaginal Dryness — ACOG. Low estrogen can cause hot flashes, vaginal dryness, irregular periods, mood changes, brain fog and reduced bone density.

A crucial honest note: these symptoms overlap with other things — thyroid problems, stress, certain medications, and more. So while they may well point to estrogen, they're a reason to get evaluated, not to self-diagnose.

What are the symptoms of low estrogen?
Common symptoms of low estrogen include hot flashes and night sweats, vaginal dryness and discomfort during sex, irregular or absent periods, mood changes, brain fog, sleep problems, and low libido. Over the longer term, low estrogen can also reduce bone density. Symptoms vary a lot between individuals, and because they overlap with other conditions, evaluation by a doctor matters.

What causes low estrogen

The most common cause is the natural transition of perimenopause and menopause, when the ovaries gradually produce less estrogen. But low estrogen isn't only a midlife issue. It can also happen after childbirth and during breastfeeding, with significant dietary restriction or very low body weight, with intense over-exercising, after removal of the ovaries, and with certain medical treatments such as some cancer therapies. Conditions affecting the ovaries or the pituitary gland can lower estrogen too.

Source: Symptoms of Low Estrogen in Women: Causes and Treatments — clinical guidance via WW Health; Low Estrogen — Healthline. Estrogen drops in perimenopause, postpartum, with restriction or over-exercise, and after ovary removal.

For younger women especially: if your periods have stopped and you're nowhere near menopause, low estrogen from under-eating or over-exercising (hypothalamic amenorrhea) is an important possibility, and a real signal worth taking to a doctor gently. It's the same under-fuelling pattern we mention in low testosterone in women.

Low estrogen isn't only a menopause story. Postpartum, under-eating and over-exercising can all pull it down, at any age.
What causes low estrogen in women?
Estrogen most commonly falls during perimenopause and menopause, as the ovaries gradually produce less. It can also drop after childbirth and during breastfeeding, with significant dietary restriction or very low body weight, with intense over-exercise, after removal of the ovaries, and with certain medical treatments such as some cancer therapies. Conditions affecting the ovaries or pituitary gland can lower estrogen too.

Do men have estrogen?

Yes, and this surprises a lot of people. Men produce estrogen too, in smaller amounts than women, and it's genuinely important for their health, supporting bone strength, sexual function and libido. Low estrogen in men can contribute to fatigue, mood changes and low sex drive, and estrogen also plays a role in male reproductive health. It's the mirror image of the testosterone story (where women produce testosterone too): these hormones aren't strictly "male" or "female." Everyone needs a balance of both; the proportions just differ. It's a nice reminder that hormones are about balance, not binaries.

Sources: What Does Estrogen Do? — Cleveland Clinic. Men produce estrogen, which matters for bone, sexual function and libido; low estrogen in men can cause low sex drive.

Do men have estrogen?
Yes. Men produce estrogen too, in smaller amounts than women, and it plays important roles in male health including bone strength, sexual function and libido. Low estrogen in men can contribute to fatigue, mood changes and low sex drive, while estrogen also matters for male reproductive health. So while estrogen is often called a female hormone, it is essential for everyone.

When to see a doctor

It's worth seeing a doctor if you have symptoms like hot flashes, vaginal dryness, irregular or missed periods, mood changes or sleep problems that are affecting your quality of life, and especially if your periods stop and you're not expecting menopause. A doctor can confirm whether estrogen is the cause, rule out other explanations like thyroid issues, and talk through options. These range from lifestyle approaches (including eating enough and not over-training) to, where appropriate, hormone therapy, which can be very effective for symptoms like hot flashes, vaginal dryness and bone protection. What's right depends entirely on you, your symptoms and your history, which is exactly the kind of decision a doctor is there for.

When should I see a doctor about low estrogen symptoms?
See a doctor if you have symptoms like hot flashes, vaginal dryness, irregular or missed periods, mood changes or sleep problems that affect your quality of life, or if your periods stop and you are not expecting menopause. A doctor can confirm whether estrogen is involved, rule out other causes such as thyroid problems, and discuss options ranging from lifestyle approaches to hormone therapy where appropriate.

To understand estrogen's role across your cycle, see estrogen vs progesterone, and for the full hormonal picture, what the menstrual cycle is.

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. Low Estrogen: Symptoms, Causes, Diagnosis, Treatment. Healthline. healthline.com
2. What Does Estrogen Do? Cleveland Clinic. my.clevelandclinic.org
3. Experiencing Vaginal Dryness? Here's What You Need to Know. ACOG. acog.org

This article is educational and not a substitute for medical advice. If you have symptoms of low estrogen, especially missed periods outside of expected menopause, please see a doctor for assessment.