Does your period affect your mood?
Yes, your menstrual cycle can affect your mood. Estrogen and progesterone rise and fall across the month, and they influence serotonin and other brain chemicals. Many people feel brighter and more energetic in the first half of the cycle, then more irritable, anxious or low in the days before their period. How strongly you feel it varies a lot from person to person.
How mood usually moves through the cycle
This is a typical pattern, not a rule. Some people barely notice changes; others feel them strongly. For the full guide see mood by cycle phase.
Why hormones change how you feel
Estrogen supports serotonin and dopamine, the brain chemicals linked to mood and motivation. Progesterone is turned into allopregnanolone, which acts on the calming GABA system. Research suggests premenstrual mood symptoms happen not because hormone levels are abnormal, but because some people's brains are more sensitive to normal changes. In a classic study, women with PMS felt mood symptoms return when hormones were added back, while women without PMS didn't.
How big is the effect?
| Experience | How common |
|---|---|
| Some premenstrual symptoms, mood included | Over 90% of people who menstruate |
| Severe premenstrual symptoms | About 5 to 8% |
| Existing depression or anxiety worsening before periods | Common; called premenstrual exacerbation |
Other things affect mood at the same time: sleep, stress, alcohol, illness and life events. That's why looking at a few cycles, not one, gives a fair picture.
How to see your own pattern
- Rate your mood once a day, at the same time, with something quick.
- Mark your period days.
- After two or three cycles, look for clusters: do your low or irritable days line up with the same cycle days?
- Use what you learn: plan lighter days, share a heads-up, or take the pattern to a doctor if it's severe.
Our mood-by-phase forecast and printable mood tracker are good starting points, and mood tracking through your cycle explains the method.
Lulu's mood forecast is built from your own check-ins. It shows how you usually feel in each phase and how often that held true, rather than claiming to predict your mood.
See a doctor if mood changes before your period disrupt your life, or if you're low most of the month. If you have thoughts of harming yourself, call your local emergency number now, or in the US call or text 988. In the UK, Samaritans are on 116 123.
Frequently asked questions
Can ovulation affect your mood?
Yes. Many feel upbeat around ovulation, and some notice a short dip right after. See ovulation mood swings.
Does birth control change cycle mood swings?
It can, in either direction. See birth control and mood.
Why do I feel different every week?
Each phase of your cycle has its own hormone mix. See why you feel different every week.
Do mood changes mean something is wrong?
Usually not. They're a normal response to hormone changes. Severe changes every cycle may be PMDD and are worth discussing with a doctor.
Sources
- Schmidt PJ et al. Differential behavioral effects of gonadal steroids in women with and in those without premenstrual syndrome. NEJM (1998)
- Office on Women's Health: Premenstrual syndrome (PMS)
- Yonkers KA, O'Brien PMS, Eriksson E. Premenstrual syndrome. The Lancet (2008)
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
Keep reading
Menstrual cycle mood: how you feel in each phase, and whyHow menstrual cycle mood changes through all four phases: what hormones do, why some people feel it more, and how to learn your own pattern.Period mood calculator: how might I feel today?Period mood calculator: find your cycle phase today and the mood people often feel in it, then learn how to build a personal forecast from your own days.How to track your mood with your cycle (and actually learn something)Use a mood tracker with your period to see your real pattern: what to log, how long to track, how to read it, and how to bring a chart to your doctor.
Why does my period make me so emotional?Why am I so emotional on my period? Hormones at their lowest, pain, tiredness and leftover PMS. Why feelings run high on day 1 to 2 and what helps.
The 4 phases of the menstrual cycle, in colorThe 4 phases of the menstrual cycle explained simply: what your hormones do in each, how long each lasts, and how mood and energy usually change.