5 signs your progesterone is dropping — and what to do about it

Progesterone often starts to fluctuate years before your last period. It's the hormone that keeps you calm, sleeping well and cycling regularly — and its decline is one of the earliest, most missed signs of perimenopause.

1. Sleep that used to be reliable, isn't

Waking at 3am with your mind racing is a classic low-progesterone sign. Progesterone acts on GABA receptors — the same calming pathway benzodiazepines use.

2. Cycles get shorter

A luteal phase under 10 days often signals inadequate progesterone. Cycles that used to be 28 days may creep down to 24 or 25.

3. Premenstrual anxiety intensifies

New or worsening premenstrual anxiety, irritability or low mood — even in women who never had significant PMS — is a common early perimenopausal signal.

4. Heavier, unpredictable periods

Without adequate progesterone to balance oestrogen, the uterine lining builds up more, producing heavier or unpredictable bleeding.

5. Breast tenderness and bloating

Relative oestrogen dominance shows up as breast fullness, water retention and stubborn weight around the middle.

The blood test that helps

A Female Hormone Profile, taken in the luteal phase (day 21 of a 28-day cycle), gives a clear read on progesterone alongside oestradiol, FSH, LH and thyroid — the full picture, not a single marker.