At a glance
- Estrogen is made mostly by the ovaries and follows a predictable pattern across your cycle, peaking near ovulation and falling before your period.
- Estrogen affects serotonin, the neurotransmitter closely tied to mood, which helps explain why its drop can affect how you feel.
- PMDD comes from a different brain reaction to the same hormone changes everyone experiences, not from unusual estrogen levels.
- A Cochrane review found non-contraceptive estrogen patches, gels or implants eased some PMS symptoms, though the evidence behind this is limited.
- Treatment decisions, like SSRIs, certain contraceptives or CBT, are made with a doctor, not based on estrogen levels alone.
What is estrogen?
Estrogen is the main sex hormone in a woman's body, made mostly by the ovaries, with smaller amounts from fat tissue and the adrenal glands. It doesn't stay level across the month. It follows a clear pattern tied to your cycle.
- Low during your period
- Rises through the follicular phase as a follicle matures
- Peaks just before ovulation
- Dips briefly after ovulation, then rises again
- Falls sharply in the days before your next period
For the full pattern phase by phase, see menstrual cycle hormones, phase by phase. The structure that makes estrogen and progesterone after ovulation is the corpus luteum.
How does estrogen relate to PMS and PMDD?
Estrogen shapes mood, largely through its effect on serotonin and other neurotransmitters in the brain (Biological Psychiatry review, 1998). As estrogen and progesterone fall together in the days before your period, serotonin activity shifts too, one reason mood symptoms cluster in the luteal phase.
That same drop plays out differently depending on the person:
- For most people, it causes mild PMS, like bloating, tiredness or irritability that eases once the period starts
- For some, it triggers a far stronger reaction, a pattern that can fit PMDD
PMDD comes from a different brain reaction to normal estrogen changes, not from having unusual estrogen levels (see what causes PMDD).
What does the research say about estrogen and mood?
Across decades of hormone and brain research, a few patterns show up consistently.
| Cycle moment | Estrogen level | What research links it to |
|---|---|---|
| Period and early follicular phase | Low | Low estrogen is linked to mood symptoms across several reproductive transitions, including PMS (Cellular and Molecular Neurobiology review, 1996) |
| Late follicular phase, near ovulation | High | Brain imaging studies find estrogen peaks change activity in regions tied to emotion, like the amygdala (Psychoneuroendocrinology systematic review, 2014) |
| Luteal phase, days before your period | Rises then falls | In a trial of perimenopausal women on hormone therapy, a higher estrogen dose during the added-progestin phase worsened mood more than a lower dose, suggesting dose matters for estrogen's mood effects (Journal of Clinical Endocrinology and Metabolism, 2003) |
A Cochrane review of non-contraceptive estrogen patches, gels and implants found the trial evidence too limited and low quality to say whether they ease PMS symptoms (Cochrane review, 2017). Estrogen's link to serotonin is well documented across decades of research (Biological Psychiatry review, 1998), and newer work is studying estrogen alongside progesterone for PMDD, postnatal depression and menopausal depression (Frontiers in Pharmacology review, 2025).
Why does this matter for treatment?
Doctors don't prescribe estrogen alone as a standard PMDD treatment. Guidelines point first to:
- SSRIs, which can work taken only in the luteal phase
- Certain hormonal contraceptives
- CBT (cognitive behavioral therapy)
A doctor decides what fits your situation and history.
If you want to see your own pattern before that conversation, Niyora is a PMS and PMDD support app that gives you an estimated PMS window, so you bring a clear record instead of a guess.
One more term worth knowing: allopregnanolone, a hormone made from progesterone that also affects mood, especially in the luteal phase.
Questions people ask
What does estrogen do in the body?+
Estrogen is the main female sex hormone, made mostly by the ovaries. It supports the reproductive cycle and also acts on brain regions tied to mood and memory, partly through its effect on serotonin. Estrogen levels rise and fall predictably across your cycle, peaking near ovulation and falling before your period.
Does low estrogen cause PMDD?+
No. PMDD isn't caused by having abnormally low estrogen levels. Research points to a different brain reaction to the normal rise and fall of estrogen and progesterone before a period, not to unusual hormone amounts. That's why a hormone blood test alone can't diagnose PMDD.
Can estrogen treatment help with PMS or PMDD?+
A Cochrane review found the trial evidence on non-contraceptive estrogen patches, gels or implants too limited to show whether they help PMS symptoms (Cochrane review, 2017). Estrogen isn't a standard PMDD treatment on its own. Guidelines favor SSRIs, certain hormonal contraceptives and CBT, decided with a doctor.
When is estrogen lowest in the cycle?+
Estrogen is lowest during your period and the early follicular phase right after, then rises as a new follicle matures. It falls again sharply in the days just before your next period starts, alongside progesterone.
Is estrogen the same as progesterone?+
No. Estrogen and progesterone are different hormones that both rise and fall across your cycle. Estrogen dominates before ovulation, while progesterone rises after, made by the corpus luteum. Both drop together before your period, which affects mood for many people.
Sources
- 1.Non-contraceptive oestrogen-containing preparations for controlling symptoms of premenstrual syndrome, The Cochrane database of systematic reviews, 2017
- 2.Emotional and cognitive functional imaging of estrogen and progesterone effects in the female human brain: a systematic review, Psychoneuroendocrinology, 2014
- 3.Increase of estrogen dose deteriorates mood during progestin phase in sequential hormonal therapy, The Journal of clinical endocrinology and metabolism, 2003
- 4.Using estrogen and progesterone to treat premenstrual dysphoric disorder, postnatal depression and menopausal depression, Frontiers in pharmacology, 2025
- 5.Estrogen-serotonin interactions: implications for affective regulation, Biological psychiatry, 1998
- 6.Estrogen control of central neurotransmission: effect on mood, mental state, and memory, Cellular and molecular neurobiology, 1996