What are the symptoms of estrogen dominance?

"Estrogen dominance" describes a relative excess of oestrogen compared with progesterone, and the symptoms people link to it include heavy or painful periods, breast tenderness, bloating, mood swings and worsening PMS.

It is worth being clear that estrogen dominance is more of a popular wellness term than a formal medical diagnosis, but the underlying idea is real: when progesterone falls faster than oestrogen, very common in perimenopause since progesterone usually drops first, the balance tips and oestrogen's effects feel unopposed. The commonly reported signs include:

• Heavy, clotty or painful periods
• Breast tenderness and swelling
• Bloating and water retention
• Mood swings, irritability or anxiety, and worsened PMS
• Headaches and trouble sleeping

Because these overlap heavily with normal perimenopause and other conditions, including thyroid problems and fibroids, symptoms alone cannot confirm a hormone imbalance, and many estrogen dominance claims online oversimplify a complex picture. The more useful way to think about it is as a balance problem rather than a pure excess: in perimenopause oestrogen is often normal or even erratic while it is the loss of progesterone underneath that lets its effects run unchecked, which is why supporting progesterone tends to help more than trying to "lower oestrogen".

One popular self-help angle is worth a measured word. Cruciferous vegetables and supplements like DIM are often promoted to "clear excess oestrogen", and while the diet is healthy in general, the evidence that these meaningfully rebalance hormones is thin. The dependable lever remains supporting progesterone and the basics, not chasing a detox.

What to do: if these symptoms are disruptive, see your GP rather than self-diagnosing from the internet, since heavy or painful periods in particular deserve a proper check. Supporting progesterone's effects with good sleep, stress management and steady blood sugar can help, and where appropriate, treatment, including progesterone as part of HRT, addresses the imbalance directly. Mapping your symptoms with our free hormone quiz is a useful first step.