At a glance
- The corpus luteum forms from the ruptured ovarian follicle right after ovulation and stays active for about two weeks.
- It's the main source of progesterone, and some estrogen, in the second half of the menstrual cycle.
- Progesterone from the corpus luteum converts into allopregnanolone, a calming brain chemical that rises and falls with it.
- When the corpus luteum breaks down, progesterone and allopregnanolone drop fast, a shift linked to PMS and PMDD symptoms.
- PMDD reflects a different reaction to this normal hormone drop, not abnormal hormone levels.
What is the corpus luteum?
The corpus luteum is a small, temporary gland. After an ovary releases an egg during ovulation, the empty follicle that held the egg transforms into this new structure. Its name comes from the Latin for "yellow body," since that's its color.
Its main job is making progesterone, and some estrogen, for roughly two weeks. That hormone support keeps the uterine lining ready in case the egg is fertilized.
A 1987 study tracked the hormone response to a GnRH injection at different points in the luteal phase:
| Luteal phase timing | Hormone response |
|---|---|
| Earliest days after ovulation | No steroid response |
| Mid-luteal phase | Significant progesterone and estradiol response |
| Late luteal phase | Response held steady |
| Two days before period | Response became inconsistent |
(Journal of Clinical Endocrinology and Metabolism, 1987)
If no pregnancy happens, the corpus luteum breaks down near the end of the luteal phase. Progesterone and estrogen fall with it, and that drop brings on a period along with many premenstrual symptoms.
Read more about these hormone shifts in the luteal phase: what's happening in your body and mood.
How does the corpus luteum relate to PMS and PMDD?
The corpus luteum's progesterone also converts into allopregnanolone, a calming compound that acts on the brain's GABA receptors, similar to some anti-anxiety medications. Allopregnanolone rises and falls with the corpus luteum's lifespan, climbing through the luteal phase and dropping fast once the gland breaks down.
PMDD is a different reaction to this normal hormone shift, not a sign that hormone levels themselves are abnormal (Schmidt et al., 1998, NEJM; Dubey et al., 2017, Molecular Psychiatry).
A trial blocked the enzyme that converts progesterone into allopregnanolone. At a high enough dose, this eased core PMDD symptoms (Neuropsychopharmacology, 2016):
- Irritability
- Sadness
- Anxiety
That result points to the corpus luteum's hormone output, and how the brain responds to it, as a real driver of premenstrual symptoms.
For more on how this fits into PMDD, see PMDD (premenstrual dysphoric disorder), explained and what causes PMDD. The calming hormone itself has its own entry at allopregnanolone: what it means.
Why does the corpus luteum matter for treatment or coping?
Because the corpus luteum is only active in the second half of the cycle, several PMDD treatments are timed to match it. In placebo-controlled trials, these approaches reduced PMDD symptoms more than placebo:
- Luteal-phase-only citalopram (Journal of Clinical Psychopharmacology, 1998)
- Luteal-phase-only sertraline (Journal of Clinical Psychiatry, 1998)
- Luteal-phase-only clomipramine (Neuropsychopharmacology, 1993)
- Continuous daily fluoxetine (Journal of Clinical Psychiatry, 1991)
A doctor decides whether luteal-phase-only dosing, continuous dosing, or another option fits you.
None of that means you have to wait out two weeks for relief in the moment. If a fight or a wave of tears catches you while your corpus luteum is still active, having somewhere to put it helps.
Niyora is a PMS and PMDD support app. Its Moon feature lets you write down what happened, see it from another angle, calm down, and draft a reply you can hold onto before you send anything.
What related terms should you know?
A few related terms show up alongside corpus luteum in cycle tracking and research:
- Luteal phase: the second half of the cycle, from ovulation to the day before your period, named for the corpus luteum that's active during it.
- Allopregnanolone: the calming brain chemical made from the progesterone the corpus luteum produces. Read allopregnanolone: what it means.
- PMDD: the diagnosis some people get when their reaction to the corpus luteum's hormone swings causes severe mood symptoms, covered in full at PMDD (premenstrual dysphoric disorder), explained.
- Dysmenorrhea: period pain, a separate issue from PMDD that can also show up once the corpus luteum breaks down and progesterone drops. See dysmenorrhea vs PMDD: what it means.
If one of these terms sounds like your own pattern, Niyora's Moon can help you track it day by day.
Questions people ask
What does the corpus luteum do?+
The corpus luteum is a temporary gland that forms after ovulation. It produces the progesterone, and some estrogen, that support the second half of the menstrual cycle, and that progesterone converts into allopregnanolone, a calming brain chemical. When the corpus luteum breaks down, both hormones fall fast, which helps trigger a period.
How long does the corpus luteum last?+
The corpus luteum typically stays active for about two weeks, covering the luteal phase from ovulation to the day before your period. If pregnancy happens, it keeps producing progesterone until the placenta can take over that job later in the first trimester.
Does the corpus luteum cause PMDD?+
The corpus luteum doesn't cause PMDD by producing abnormal hormone levels. Research points to PMDD being a different brain reaction to the normal hormone drop that happens when the corpus luteum breaks down, not a problem with the hormones themselves (Schmidt et al., 1998; Dubey et al., 2017).
Can the corpus luteum affect your mood before your period?+
Yes. As the corpus luteum ages, it changes how much progesterone and allopregnanolone it releases, and that shift affects mood for many people. Most notice mild changes that ease once a period starts. A smaller group has a stronger reaction that fits a PMDD pattern.
Sources
- 1.5α-Reductase Inhibition Prevents the Luteal Phase Increase in Plasma Allopregnanolone Levels and Mitigates Symptoms in Women with Premenstrual Dysphoric Disorder, Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2016
- 2.Luteal responses to gonadotropin-releasing hormone during the luteal phase: relation to the age of corpus luteum, The Journal of clinical endocrinology and metabolism, 1987
- 3.Citalopram in premenstrual dysphoria: is intermittent treatment during luteal phases more effective than continuous medication throughout the menstrual cycle?, Journal of clinical psychopharmacology, 1998
- 4.Clomipramine administered during the luteal phase reduces the symptoms of premenstrual syndrome: a placebo-controlled trial, Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 1993
- 5.Treatment of premenstrual dysphoric disorder with sertraline during the luteal phase: a randomized, double-blind, placebo-controlled crossover trial, The Journal of clinical psychiatry, 1998
- 6.Fluoxetine in the treatment of late luteal phase dysphoric disorder, The Journal of clinical psychiatry, 1991