The basics
Does your energy and mood change through the menstrual cycle?
For some people, yes: energy and mood shift with the cycle. Others notice nothing at all. Hormones do change through the month, with estrogen rising before ovulation and progesterone after it, but a review of 47 studies found no clear premenstrual mood pattern across people in general. Your own log tells you more than a generic chart.
What are the hormones doing?
In the first part of the cycle, an egg matures and estrogen rises. After ovulation, progesterone rises. If there is no pregnancy, hormones fall and the next period starts. That is the background. How you feel on top of it depends on sleep, stress, food, health and plenty else.
Why might I feel more tired some days?
Tiredness is one of the symptoms the NHS lists for PMS, in the days before a period. Heavy periods can also cause low iron, and the NHS lists feeling very tired or short of breath a lot as a sign. If you’re tired all the time, not only in one part of the cycle, it’s worth mentioning to a doctor.
Do I get more energy at certain times?
Some people say energy often comes back in the days after their period ends, and that evenings feel softer in the last week before the next one. These are common descriptions, not rules, and plenty of people don’t match them.
How can I find my own pattern?
Log energy and mood each day for three cycles or so. Note the day of your cycle next to each entry. After a few months you can see whether anything lines up, and plan around it. If you plan work, workouts and plans by the cycle, treat it as a guess you can check, not a guarantee.
Seventh shows your phase on the Today screen and lets you log mood and energy in a couple of taps, so the pattern builds up without effort.
When should I see a doctor?
See a doctor if mood or energy changes get in the way of your daily life, if lifestyle changes haven’t helped, or if you have thoughts of suicide at any time. In that case, call your local emergency number or a support line now.
Frequently asked questions
Is “cycle syncing” proven?
Cycle syncing means planning work, workouts and meals by cycle phase. Patterns differ a lot between people, and a review of 47 studies found no clear premenstrual mood pattern across people in general. Check your own log before you plan around it.
Can the pill change my energy or mood?
Hormonal contraception changes your hormones, so some people notice changes. If you do, tell a doctor or pharmacist. They can talk through other options.
How many cycles do I need to log?
The NHS suggests noting symptoms for at least 2 cycles to see whether they line up with your period.
Sources
Seventh is a free period and cycle tracker for iPhone and iPad, by doogud. This article is general information, not medical advice. If something feels wrong, see a doctor.
