Your cycle, explained
The menstrual cycle phases, and what the luteal phase does to you
The menstrual cycle has four phases: your period (menstruation), the follicular phase, ovulation and the luteal phase. The luteal phase is the stretch between ovulation and your next period, usually about 12 days, and it is when premenstrual symptoms show up: bloating, sore breasts, cravings, tiredness, low mood or irritability, and often a temporary rise on the scale.
Key facts
A menstrual cycle runs from the first day of one period to the first day of the next, usually 21 to 35 days. In more than 600,000 tracked cycles, the luteal phase averaged 12.4 days and the follicular phase 16.9 days, and most of the difference in cycle length came from the follicular phase. Common luteal phase symptoms include bloating, breast tenderness, cravings, tiredness and mood changes; feeling "puffy" tends to peak around the first day of your period.
The four phases at a glance
- Period · days 1–5Bleeding, usually 2 to 7 days. Oestrogen and progesterone are both low. Bloating and cramps often ease after the first day or two.
- Follicular · days 6–13Oestrogen rises as an egg matures. Many women feel their energy and mood lift. This phase starts on day 1 and overlaps your period; its length varies most.
- Ovulation · days 14–15An egg is released, about 12 to 14 days before your next period, not always on day 14.
- Luteal · days 16–23Progesterone rises. Body temperature goes up slightly. Appetite can increase.
- Late luteal · days 24–28Progesterone and oestrogen fall. This is the premenstrual week, when symptoms are most common.
Day numbers are an example. Your cycle can be anywhere from 21 to 35 days and still be normal, and the follicular phase is the part that stretches or shrinks.
How long is each phase?
Your period is day 1. The follicular phase also starts on day 1 and runs until ovulation, so it overlaps your period. The luteal phase runs from ovulation to the day before your next period.
| Phase | Average length | Typical range |
|---|---|---|
| Whole cycle | 29.3 days | 21 to 35 days is normal |
| Follicular phase (day 1 to ovulation) | 16.9 days | About 10 to 30 days |
| Luteal phase (ovulation to period) | 12.4 days | About 7 to 17 days |
Source: Bull and colleagues, npj Digital Medicine, 2019 (app data from 124,648 women; the study was funded by the app maker). Normal range: NHS.
That is why "ovulation on day 14" is only true for some women. If your cycle is 32 days, you probably ovulate around day 18 or 19; if it is 25 days, around day 11. Cycles also tend to get a little shorter from your mid-20s to mid-40s, mostly because the follicular phase shortens.
Luteal phase symptoms: what is normal
Most women notice something in the week or two before a period. The NHS lists the most common premenstrual symptoms as:
- Bloating and feeling puffy, often with a higher reading on the scale
- Breast tenderness
- Tiredness or trouble sleeping
- Mood swings: feeling irritable, low, anxious or emotional
- Changes in appetite or food cravings
- Headaches, spotty skin and greasy hair
In Turtle members' own symptom logs, cramps, tiredness and bloating are the three they log most often. See the period symptoms women log most.
When to see your GP: If symptoms are severe enough to affect your work, relationships or daily life, see your GP. Very low mood before every period can be premenstrual dysphoric disorder (PMDD), which is treatable.
Why you weigh more in the luteal phase
A jump of a kilo or two before your period is common, and it is almost all water, not fat. Hormone shifts change how your body handles fluid and salt, and in a year-long diary study of healthy women, self-reported fluid retention was lowest in the middle of the follicular phase, rose through the second half of the cycle and peaked on the first day of the period.
So compare like with like: your weight in this luteal phase against your last luteal phase, or a weekly average, rather than one morning against the day after your period ends. More on this in do you gain weight on your period?
Know your own pattern
See your cycle and your weight side by side
Log your period in Turtle and see how your weight moves across your own cycle, so a luteal-phase jump stops being scary.
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Hunger, cravings and energy
Your resting metabolism may tick up slightly in the luteal phase. A review of 26 studies found a small rise, but in newer studies the effect was smaller and not statistically clear, so don't count on it to "earn" extra food.
Many women do feel hungrier and want sweeter, saltier food before a period. Planning for it works better than fighting it: regular meals with protein and fibre, and a snack you actually enjoy. If you want ideas, ParrotPal's high-protein snack list is a good place to start (ParrotPal is a separate calorie-tracking app from Turtle's co-founder).
Should you train differently in each phase?
You don't have to. The largest review of the research, 78 studies, found that performance might be very slightly lower in the early follicular phase (your period), but the effect was "trivial", and the authors recommend going by how you feel rather than a fixed rule. A later umbrella review found no clear evidence that cycle phase changes strength or muscle gains from resistance training.
If you feel flat or crampy, a lighter session or a walk is fine. If you feel strong, train. Read more in cycle syncing: what the evidence says.
What the research says
Each study below was checked against its PubMed record, or read at source for NHS, NICE and government pages, on 7 October 2026.
In 612,613 cycles tracked in an app, the average cycle was 29.3 days, the follicular phase 16.9 days and the luteal phase 12.4 days. Cycle length fell by about 0.18 days a year between ages 25 and 45.
Bull JR, Rowland SP, Scherwitzl EB, et al. (2019). Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles. NPJ digital medicine. 2:83 doi.org/10.1038/s41746-019-0152-7
In 765 cycles kept in daily diaries, self-reported fluid retention was lowest in the mid-follicular phase and peaked on the first day of the period.
White CP, Hitchcock CL, Vigna YM, et al. (2011). Fluid Retention over the Menstrual Cycle: 1-Year Data from the Prospective Ovulation Cohort. Obstetrics and gynecology international. 2011:138451 doi.org/10.1155/2011/138451
Across 26 studies, resting metabolic rate was slightly higher in the luteal phase, but the difference was smaller and not statistically significant in studies published since 2000.
Benton MJ, Hutchins AM, Dawes JJ (2020). Effect of menstrual cycle on resting metabolism: A systematic review and meta-analysis. PloS one. 15(7):e0236025 doi.org/10.1371/journal.pone.0236025
A meta-analysis of 78 studies found exercise performance might be trivially lower in the early follicular phase, and recommended a personal approach rather than general rules.
McNulty KL, Elliott-Sale KJ, Dolan E, et al. (2020). The Effects of Menstrual Cycle Phase on Exercise Performance in Eumenorrheic Women: A Systematic Review and Meta-Analysis. Sports medicine (Auckland, N.Z.). 50(10):1813-1827 doi.org/10.1007/s40279-020-01319-3
An umbrella review concluded it is premature to say cycle phase appreciably affects strength or muscle gains from resistance training.
Colenso-Semple LM, D'Souza AC, Elliott-Sale KJ, et al. (2023). Current evidence shows no influence of women's menstrual cycle phase on acute strength performance or adaptations to resistance exercise training. Frontiers in sports and active living. 5:1054542 doi.org/10.3389/fspor.2023.1054542
The NHS lists the common premenstrual symptoms (mood swings, tiredness, bloating, breast tenderness, headaches, cravings) and advises seeing a GP if they affect daily life.
NHS. PMS (premenstrual syndrome). NHS website. Accessed 7 October 2026. www.nhs.uk/conditions/pre-menstrual-syndrome/
The NHS says cycles commonly range from 21 to 35 days, and a period lasts 2 to 7 days, usually about 5.
NHS. Periods. NHS website. Accessed 7 October 2026. www.nhs.uk/conditions/periods/
Questions women ask
What are the 4 phases of the menstrual cycle?
Menstruation (your period), the follicular phase (day 1 until ovulation, overlapping your period), ovulation, and the luteal phase (ovulation until your next period).
What are the symptoms of the luteal phase?
Common ones are bloating, breast tenderness, food cravings, tiredness or poor sleep, headaches, spots, and mood changes such as irritability or low mood. They are usually strongest in the few days before your period.
How long is the luteal phase?
Usually 10 to 16 days. In a study of more than 600,000 tracked cycles it averaged 12.4 days. It varies less than the follicular phase.
Do you gain weight in the luteal phase?
Many women see the scale go up by up to a kilo or two before their period. It is mostly water and usually goes once your period starts. Compare weekly averages, or the same phase month to month.
Is it normal to be hungrier before your period?
Yes, it is common. Regular meals with protein and fibre, and planning a snack you enjoy, help more than strict restriction.
When should I see a GP about my cycle?
If your periods are very painful or heavy, you bleed between periods or after sex, your cycle is often shorter than 21 or longer than 35 days, or premenstrual symptoms affect your daily life.
This guide is general information, not medical advice. It isn't tailored to you and doesn't replace advice from your GP or another qualified professional. If something's worrying you, speak to your GP. LeanShield™ is a trademark of ParrotPal Ltd: it rates the habits linked to protecting muscle, is not a medical device and doesn't measure muscle.