on August 18, 2026
For years, "oestrogen dominance" has been the go-to explanation whenever someone's cycle feels off: heavy bleeding, PMS, spotting before a period, mood swings in the second half of the month. It's become shorthand in wellness spaces for "too much oestrogen, not enough progesterone," and the implied fix is almost always the same: lower your oestrogen.
I think that framing gets it backwards, and it's worth unpacking why, because oestrogen is one of the most misunderstood hormones in the cycle, and it's carrying a reputation it doesn't deserve.
Oestrogen Is Not the Villain
Oestradiol, the main form of oestrogen your body produces during your reproductive years, is doing far more for you than most people realise, including, frankly, a lot of practitioners in the holistic and natural health space who should know better.
It supports skin elasticity and collagen production. It plays a role in mood regulation and cognitive sharpness. It supports gut lining integrity, helps regulate the immune system, and even affects mitochondrial function, the energy-producing machinery inside your cells. It's cardioprotective. It supports libido. And it helps your body maintain a healthy relationship with muscle mass and insulin sensitivity, which is a big part of why body composition tends to shift after menopause, when oestrogen production drops off.
None of that sounds like a hormone we should be trying to suppress.
What Does Oestrogen Dominance Actually Look Like?
Before we get into the mechanics, it's worth acknowledging why so many people land on this diagnosis in the first place. The symptom picture is real, even if the label is imprecise. Common signs include:
- Heavy, irregular or painful periods
- Weight changes, particularly around the hips, thighs and abdomen
- Mood shifts that feel like anxiety, irritability or low-grade depression, often in the second half of the cycle
- Breast tenderness around ovulation or menstruation, or fibrocystic changes
- Persistent fatigue
- Reduced libido
- Bloating or water retention
- Headaches
- Nausea, most commonly around ovulation but sometimes throughout the cycle
These symptoms are worth taking seriously. They're telling you something about your hormonal environment. The question is whether "oestrogen dominance" is actually the most accurate or useful way to interpret them.
So Where Does the "Dominance" Idea Come From?
Here's the piece that gets skipped over in most conversations about hormone balance: progesterone isn't supposed to be present for the entire cycle. It's only produced after ovulation, by the structure left behind once an egg is released. Before that happens, progesterone is essentially at zero, not because something is wrong, but because there's nothing yet to produce it.
That means for roughly half of every cycle, sometimes more if your cycle runs long, it's completely normal to have plenty of oestrogen and no progesterone at all. That's not a hormone imbalance. That's just where you are in the month.
The real question isn't "why is my oestrogen so high?" It's "did I ovulate this cycle?"
The Real Culprit: Anovulation, Not Excess Oestrogen
When progesterone stays low or absent even in the days leading up to a period, the window where it should be doing its job, the underlying issue is almost always that ovulation didn't happen, or didn't happen well. No egg release means no corpus luteum, which means no progesterone, regardless of how much oestrogen is circulating.
This is a completely different problem than "too much oestrogen," and it calls for a different conversation. Instead of trying to bring oestrogen down, the more useful question becomes: what's interfering with ovulation? PMOS is one of the most common underlying causes, but stress, under-eating, thyroid issues, and perimenopause can all disrupt it too.
There's also a meaningful difference between not ovulating at all (no progesterone) and ovulating but under-producing progesterone afterward (low progesterone). They can look similar symptomatically, with spotting, PMS, and heavy bleeding, but they're different mechanisms with different paths forward. Lumping both under "oestrogen dominance" erases that distinction and can send people chasing the wrong fix.
That said, genuine oestrogen excess does exist. It can come from external sources, including certain medications, hormonal therapies, or ongoing exposure to compounds called xenoestrogens. These are substances found in some plastics, personal care products, pesticides and household cleaners that can mimic oestrogen's effects in the body. It can also arise internally, through endocrine disorders, impaired liver detoxification, or gut imbalances that reduce the body's ability to clear oestrogen efficiently. In these cases, the issue really is too much oestrogen, not just a relative absence of progesterone. But even then, the solution is rarely "suppress oestrogen broadly." It's about identifying and addressing the specific driver.
What's Actually Driving the Imbalance?
Whether the issue is anovulation, low progesterone, or genuine oestrogen excess, there are usually identifiable factors contributing to it. Chronic stress is one of the most significant. When the body is under sustained pressure, it prioritises cortisol production, and this can come at the expense of progesterone. The communication pathways between the brain, adrenal glands and ovaries are also sensitive to stress, and disruption here can ripple through the entire hormonal system.
Age is another factor that rarely gets discussed with enough nuance. Progesterone tends to decline earlier and more steeply than oestrogen as we move through our late thirties and into perimenopause. The result is that oestrogen can appear relatively dominant, not because it has increased, but because progesterone has quietly stepped back. This is a normal part of the hormonal transition toward menopause, but it can produce a symptom picture that looks very similar to oestrogen dominance, even when oestrogen levels are perfectly ordinary or even on the lower side.
Sleep is another underappreciated factor. Poor or insufficient sleep doesn't just leave you tired; it actively interferes with hormonal regulation and can amplify the symptoms of any existing imbalance.
Nutritional status matters too. Deficiencies in key nutrients including magnesium, B6, zinc, folate, omega-3 fatty acids, protein and fibre can impair both hormone production and the body's ability to metabolise and clear oestrogen. The liver plays a central role in oestrogen detoxification, and it needs adequate nutritional support to do that job well. When gut health is compromised, particularly with bacterial overgrowth, the body's capacity to process and eliminate oestrogen can be further reduced.
Underlying conditions including hypothyroidism, insulin resistance, endometriosis, fibroids and PMOS can all contribute to hormonal imbalance through different mechanisms. These aren't rare edge cases; they're common, and they're worth ruling in or out before assuming the problem is simply "too much oestrogen."
Why Cycle Tracking Changes Everything
One of the most powerful things you can do to understand your hormonal health is to track your cycle consistently over time. When you have a clear picture of your cycle length, temperature patterns, and the timing of ovulation, you can start to see what's actually happening beneath the surface. Cycle tracking reveals whether you're ovulating at all, how long your luteal phase is, and whether progesterone has a chance to do its job each month.
This kind of data transforms vague symptoms like mood shifts, bloating, or irregular bleeding into meaningful patterns you can bring to a practitioner or use to guide your own decisions. Tools like Daysy and Lady-Comp use basal body temperature tracking to give you a precise, daily picture of where you are in your cycle, including whether ovulation has occurred. Rather than guessing whether your hormones are "balanced," you have real evidence of how your cycle is functioning, and that's where genuine understanding of hormonal imbalances begins.
Why the Language Matters
I don't think this is just semantics. If someone believes their problem is "too much oestrogen," they may end up avoiding a hormone that's actually protective for them, restricting foods, adding supplements, or following protocols aimed at lowering oestrogen, when what their cycle actually needed was support for ovulation itself.
Reframing it as anovulation, or progesterone deficiency, points toward the actual lever: cycle health and consistent ovulation, not oestrogen suppression. And getting that distinction right matters beyond symptom relief. Left unaddressed, genuine hormonal imbalances, whether driven by anovulation, oestrogen excess, or an underlying condition, can have longer-term consequences for bone density, cardiovascular health, and overall wellbeing. The goal isn't to dismiss the symptoms. It's to understand them accurately enough to actually address them.
The Takeaway
Oestrogen isn't dominant necessarily. It's usually just doing its job, largely unopposed, because ovulation didn't happen at all that month. Understanding that distinction changes the whole conversation, from "how do I lower my oestrogen" to "how do I support my body in ovulating consistently," which, in my experience, is almost always the more useful question to be asking.
If you're ready to start tracking, Daysy and Lady-Comp are both designed to make that process simple, accurate, and genuinely informative.
