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's 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 are heavy, clotty, or painful periods; breast tenderness and swelling; bloating and water retention; mood swings, irritability, or anxiety; worsened PMS; headaches; and trouble sleeping.

Because these overlap heavily with normal perimenopause and other conditions (including thyroid problems and fibroids), symptoms alone can't confirm a hormone imbalance — and many “estrogen dominance” claims online oversimplify a complex picture.

What to do: if these symptoms are disruptive, see your GP rather than self-diagnosing from the internet — 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.