Cycle × state · 6 min
Depression or hormones: how observation tells them apart
"Is it depression or hormones?" — this question has an answer, but it isn't guessed. The pattern over time decides, not symptom intensity on any given day.
What looks similar
Low energy, no motivation, irritability, tearfulness, trouble concentrating, appetite changes, disrupted sleep — all show up in both depression and cyclical hormonal conditions (PMS, PMDD, perimenopause). From a single day's view they're indistinguishable.
What separates them — the pattern over time
Depression (depressive episode)
- Symptoms persist for at least 2 weeks, daily or near-daily.
- They don't resolve with menstruation or any other cyclical event.
- They affect functioning regardless of cycle phase.
- The week after menstruation isn't a "good week".
Cyclical (PMS/PMDD)
- Symptoms appear in the luteal phase — the second half of the cycle.
- They resolve within days of bleeding onset.
- The week after menstruation — full return to baseline, you feel like yourself.
- The pattern repeats cycle after cycle in a similar window.
Perimenopause
- Mood becomes less stable regardless of cycle phase.
- Hot flashes, sleep disturbances, cycle changes accompany it.
- Typically appears after 40.
How to check — without guessing
The only reliable way is observation across 2 full cycles. Daily notes: mood (0–10), energy (0–10), irritability, sleep, key events. After 2 cycles you look at the chart and see whether bad days cluster in a specific pre-menstrual window or scatter evenly.
If they cluster — hormonal pattern. If they're constant or random — talk to a GP or psychiatrist.
What doesn't help distinguish them
- Hormone blood tests on a random day — results are usually normal in both PMS and PMDD.
- A depression scale filled out one day — shows a point-in-time state, not a pattern.
- Asking "do I have a reason to be sad" — in depression the reason is often absent, in PMS too.
What can run in parallel
Hormones and depression aren't mutually exclusive. You can have PMDD and a depressive episode at the same time. Then you see two patterns: a baseline that doesn't change with cycle, plus additional luteal worsening. Diagnosing and treating both needs a psychiatrist — but 2 cycles of observation is the fastest, most concrete thing to bring to that conversation.