Uncontrollable crying during your period: why it happens

Crying during your period usually comes down to a hormone drop that's still working its way through your system. Estrogen and progesterone fall sharply in the days before bleeding starts, then stay low through the first day or two of your period. That drop affects serotonin, the brain chemical that helps keep mood steady, and some brains react more strongly to the shift than others.

That's part of why one person barely notices the week before her period and another cries at a dog food commercial. Crying is often how that buildup finds a way out, even for people who barely notice the week before their period. The same drop is behind crying before your period, just earlier in the curve.

PMDD, a diagnosis separate from ordinary PMS, is a different reaction to those same normal hormone levels, not a sign of abnormal hormones (Schmidt et al., 1998; Dubey et al., 2017). If crying before your period comes with intense mood swings or rejection sensitivity, that pattern is worth tracking rather than brushing off.

Yes. Crying before or during your period is one of the most common symptoms inside premenstrual syndrome, which covers mood and physical symptoms that show up in the one to two weeks before your period and ease once it starts (ACOG Clinical Practice Guideline No. 7, 2023). Most people with a uterus notice at least some premenstrual mood change, and crying easily sits near the top of the list alongside irritability and tension.

What's less talked about is how it can continue once your period arrives, especially on the first day, when hormone levels hit the lowest point of the whole cycle and haven't started climbing back up yet. If you're the kind of person who cries at the start of your period rather than right before it, you're not off pattern. You're just further along the same hormone curve.

For most people, period-related crying eases within the first one to two days of bleeding, as estrogen and progesterone start climbing again. If your tears taper off by day two or three, that's a textbook hormone pattern, and a PMS calculator can show you roughly when to expect that window each cycle.

If it drags on for most of your period, or it was already intense for a full week beforehand, the picture gets more complicated. PMDD symptoms typically ease within a few days of your period starting and stay minimal the following week, confirmed only by daily ratings over at least two cycles, not by memory alone. A pattern that lasts longer than that, or barely lets up at all, points toward something other than a simple hormone drop, including premenstrual exacerbation, where a condition like depression or anxiety is present all month but worsens beforehand.

Crying before or during your period usually sits inside ordinary PMS, but the same symptom can point to PMDD or premenstrual exacerbation depending on how severe and disruptive it is.

PMDD affects about 1.6% of women and girls when the diagnosis is confirmed with daily tracking, and about 3.2% on a provisional diagnosis (Reilly et al., 2024, Journal of Affective Disorders, pubmed.ncbi.nlm.nih.gov/38199397). Crying on its own doesn't put you in that group. What matters is whether it comes with four other symptoms, one of them a mood symptom, most months.

Crying itself isn't something you need to fight. Letting the tears finish usually calms the wave faster than trying to hold them back. But if you're at work, mid-conversation, or just want it to ease sooner, a few things can help right now.

Splash cold water on your face or step outside for a minute. That resets your breathing, which is where a lot of the physical crying response lives. Breathe out for six counts, longer than the inhale, to tell your body the acute wave is passing.

A 2018 randomized trial found swimming eased anxiety (0 vs. 5), tension (3 vs. 12), and headaches (3 vs. 15; P < 0.001) compared with no exercise, but crying itself didn't improve more than it did in the control group. Movement can help the symptoms around the tears without touching the crying directly, so it may need a more direct approach, like naming what's underneath it. How to stop crying when it won't stop has more on that.

If you want somewhere to put what's underneath the tears, Niyora is a PMS and PMDD support app. Its Moon feature lets you write what happened, see it from another angle, and calm down before you decide what, if anything, to say to anyone.

A GP or gynecologist needs two months of daily notes on when the crying starts, how intense it gets, and when it eases, to tell PMS, PMDD, and premenstrual exacerbation apart.

Treatment depends on what's driving it. Guidelines point to options like SSRIs, which some people take only in the second half of their cycle, certain hormonal contraceptives, and cognitive behavioral therapy, with a doctor deciding what fits your situation (ACOG Clinical Practice Guideline No. 7, 2023). A trial of daily fluoxetine taken only before the period found it eased mood symptoms within the first treatment cycle. None of this is urgent to sort out tonight. It's just useful to know it's there if the pattern keeps repeating.