At Jade Peak we believe understanding women's health, and the hormones that quietly run so much of it, is something every woman deserves to feel informed about. Estrogen gets talked about as if it's only about periods and having babies. The first thing experts will tell you is that this is a huge understatement, and the second is that both too little and too much of it cause problems. Here's the clear version.
What estrogen actually does
Estrogen runs your menstrual cycle, yes, but it reaches far beyond that. It helps keep your bones strong, supports your heart and blood vessels, plays a role in mood and memory in the brain, keeps skin and tissues supple, and supports libido. It's genuinely protective, which is why when it drifts too high or too low, you tend to feel it in several places at once, not just in your cycle.
When estrogen runs low
Low estrogen can show up as:
Hot flushes and night sweats
Irregular or missing periods
Vaginal dryness and lower libido
Mood dips, anxiety, poor sleep and brain fog
Over time, reduced bone density
The most common cause is the natural one: perimenopause and menopause, when estrogen doesn't so much decline smoothly as swing around erratically before settling low. But it's not only an "older woman" issue. Postpartum, certain medical conditions, and surgery or cancer treatment can all lower it. And here's the one that matters most for active women: under-fuelling combined with hard training and stress can switch estrogen production down, a condition called hypothalamic amenorrhea, where the body decides it doesn't have the energy to spare and your period stops. Losing your period is never a sign of being "lean" or "fit." It's a warning that estrogen has dropped and your bones and heart are exposed. The good news is it's often reversible once you eat enough for your training again.
When estrogen runs high, or "unopposed"
This one comes with a nuance experts really want understood: what people call "estrogen dominance" often isn't sky-high estrogen at all, but estrogen that's high relative to progesterone, because progesterone has fallen. It can look like:
Heavy, painful periods and worse PMS
Mood swings and irritability
Bloating, breast tenderness and headaches or migraines
Sleep problems and low libido
It's common in early perimenopause, in cycles where you don't ovulate (as in PCOS), and when progesterone is low. Over time, genuinely unopposed estrogen is worth checking, because it can drive overgrowth in tissues like the uterine lining.
What experts really want you to understand
A few things they'd underline. First, these symptom lists overlap heavily with stress, PMS, thyroid issues and plain overtraining, so you cannot diagnose your own estrogen from a checklist. Proper testing usually has to be timed to your cycle and read by a professional. Second, it's about balance and context, not a single high-or-low verdict. Third, please don't self-treat with hormone supplements you found online, because both directions carry real risks. And finally, for anyone active: a disappearing period is a signal to fuel more and see a doctor, not a box to tick.
This is general information, not medical advice. Hormones are genuinely complicated and individual, so if any of this sounds like you, timed blood tests and a conversation with a doctor or gynaecologist are the right next step.
Originally published at jadepeak.com.
