Hormones before your period

Progesterone is the hormone that falls hardest before your period. It rises after ovulation, holds through most of the luteal phase, then drops sharply in the final days before bleeding starts, if you haven't gotten pregnant that cycle.

Estrogen follows a similar arc but less steeply. It dips briefly around ovulation, rises again in the mid-luteal phase, then falls alongside progesterone right before your period.

Both hormones hitting their lowest point at the same time is what sets off PMS and PMDD symptoms for a lot of people. For more on estrogen specifically, see does estrogen drop before your period. For how progesterone affects mood day to day, see how progesterone makes you feel and the plain definition in the progesterone glossary entry.

The one to two weeks before your period is the luteal phase, the second half of your cycle. Progesterone and estrogen are both high through most of it, which is part of why energy and mood can feel steadier mid-cycle.

In the final days of the luteal phase, both hormones fall fast. That drop reaches brain areas that handle mood, sleep and how you read other people's faces and tone. A systematic review found that recognizing facial expressions tends to be sharper in the follicular phase after your period than in the days right before it (1).

Physically, the same drop can bring bloating, breast tenderness, headaches and fatigue. For a day-by-day picture of where you are in this shift, see the luteal phase: what's happening in your body and mood and the menstrual cycle hormones chart.

There's no supplement or routine that resets progesterone and estrogen to a different pattern. The drop before your period happens every cycle, whether or not you have PMDD.

What guidelines recommend instead is treating the reaction, not the hormone level itself. First-line options include SSRIs, which some people take only in the luteal phase rather than every day, certain hormonal contraceptives that keep hormone levels steadier across the month, and CBT. For PMDD that doesn't respond to those, specialists sometimes use GnRH analogues, which pause ovulation and the hormone swings that come with it, alongside add-back hormones to limit menopause-like side effects (5, 6).

A doctor decides which option fits, based on your symptoms, history and what you've already tried. None of this is something to start or adjust on your own.

A 2021 systematic review and meta-analysis covering more than 5,000 women looked at hormone and gene patterns across mood disorders tied to reproductive hormones. It found that PMDD is paralleled by lower luteal-phase estradiol compared with women who don't have PMDD (3).

Other research has looked at what's happening in the body during that drop. A cohort study tracking women daily across the cycle found changes in immune and oxidative stress markers alongside the hormone shifts, with progesterone itself linked to lower levels of some of those stress markers (4).

On how common this all is, a 2025 Cochrane review puts premenstrual syndrome at 20% to 30% of women of reproductive age, and PMDD, the more severe form, at 3% to 8% (6), a broader range than the 1.6% confirmed-diagnosis, 3.2% provisional-diagnosis figures used elsewhere on this site, which come from a 2024 study (Reilly et al.) using prospective daily symptom ratings rather than retrospective report. Both numbers describe how symptoms show up, not how low or high anyone's hormones are on a blood test.

The hormone trigger is the same: both PMS and PMDD follow the drop in estrogen and progesterone before your period. What differs is the pattern and how strongly the body reacts to it.

PMS is common and eases on its own once your period starts. PMDD is a DSM-5-TR diagnosis that needs at least five symptoms, one of them a mood symptom like rejection sensitivity, irritability, low mood or anxiety, confirmed with daily ratings over at least two cycles rather than a memory of one bad month. A separate pattern, premenstrual exacerbation, is an existing condition like depression or ADHD that's present all month but flares before your period.

If you want to see where your symptoms land, the PMS impact quiz walks through how they're affecting your days. It won't diagnose you, but it's a starting point for sorting out which pattern fits.

Track your symptoms against your actual cycle day for two full cycles. Patterns that look random day to day often make sense once you line them up with where you are in the luteal phase. That chart of where estrogen and progesterone sit at each point can help you spot the pattern.

Movement helps some people more than others. In one small randomized trial, women with PMS who did eight weeks of aerobic exercise, three times a week, reported fewer symptoms by the end of the trial (2). It's not a fix for everyone, but it's low-risk and worth trying.

In the moment, when a fight with your partner or a wave of tears hits hard, the hormone explanation doesn't make the feeling less real, and it doesn't tell you what to say next. Niyora is a PMS and PMDD support app. Its Moon feature lets you write down what happened, see it from another angle, calm down first, and draft a reply you can hold onto for 20 minutes before you send anything.

If this pattern costs you a week of functioning every month, or you've had thoughts of hurting yourself, see a GP or gynecologist. Bring two months of daily notes on your mood and physical symptoms, lined up against your cycle day.

This pattern fits PMDD for some people and premenstrual exacerbation of an existing condition for others. A doctor is the one who can tell you which, and that distinction changes what treatment makes sense.