Hormonal · Mood
Mood swings & irritability
If your mood is cyclical with your period, or newly volatile in your late 30s-40s, the signal is in your hormone ratios - not just their absolute values.
Feels like
Does this sound like you?
- Rage a week before your period
- Tearfulness without an obvious trigger
- Feeling like a different person depending on cycle phase
- Sleep deteriorating on top of mood shifts
What to measure
The biomarkers that explain this symptom.
Grouped by the panel that tests them. We usually recommend running the top two panels together - patterns only show when you can see biomarkers next to each other.
Panel
hormones
- Progesterone (luteal)Low luteal progesterone is the single strongest predictor of PMDD-type symptoms.
- EstradiolPerimenopausal estradiol volatility drives mood instability.
- Cortisol (AM)Dysregulated cortisol amplifies hormonal mood shifts.
Panel
nutrients
- Vitamin DLow D is associated with depressive symptoms, especially seasonal.
Panel
thyroid
- TSHSubclinical hypothyroidism commonly presents as low mood + irritability.
Patterns we see
Three common clusters.
Your specific pattern will be unique, but most people land in one of these.
01
Luteal-phase crash
Progesterone drops sharply mid-luteal. Symptoms 5–10 days before period.
02
Perimenopausal volatility
Estradiol swings 60+ pg/mL cycle-to-cycle.
03
Thyroid-mood
TSH 2.5+ with irritability that predates any cycle shift.
Ready to look?
Order the hormones + nutrients panels.
Running the top two panels together is what lets us see patterns. Add a third if you want a fuller picture - most people benefit from the trio.
Further reading