Learn about the four phases of the menstrual cycle, how hormones change throughout the month, when ovulation may occur, and how tracking your cycle can support reproductive health.
Understanding the phases of menstrual cycle can help you learn how your body prepares for a possible pregnancy, why symptoms change throughout the month, and when ovulation may occur. The menstrual cycle is controlled by hormones that influence the ovaries and the lining of the uterus.
Although a 28-day cycle is often used as an example, cycle length varies between individuals. Understanding the four phases—menstrual, follicular, ovulation, and luteal—can help you recognize your own patterns and make informed decisions about reproductive health.
What Are the Four Phases of the Menstrual Cycle?
The menstrual cycle has four commonly described phases:
- Menstrual phase: The uterine lining sheds, causing menstrual bleeding.
- Follicular phase: Hormones stimulate follicles in the ovaries to develop, while the uterine lining begins to thicken.
- Ovulation phase: An ovary releases an egg.
- Luteal phase: Progesterone helps prepare the uterine lining for a possible pregnancy.
The menstrual and follicular phases overlap. The cycle begins on the first day of menstrual bleeding and ends the day before the next period begins.
1. Menstrual Phase: When Your Period Begins
The menstrual phase starts on day one of your period. If pregnancy has not occurred, falling hormone levels trigger the shedding of the uterine lining through the vagina.
What happens during this phase?
- Menstrual bleeding begins.
- Estrogen and progesterone levels are relatively low.
- You may experience cramps, fatigue, bloating, headaches, or mood changes.
- Bleeding commonly lasts around 2–7 days.
Practical tip: Track your bleeding, pain, and other symptoms. Gentle movement, adequate rest, and a warm compress may help with ordinary menstrual discomfort. Severe pain or unusually heavy bleeding deserves medical attention.
2. Follicular Phase: An Egg Begins to Mature
The follicular phase also starts on the first day of your period and continues until ovulation. The pituitary gland releases follicle-stimulating hormone (FSH), which encourages ovarian follicles to develop. Usually, one follicle becomes dominant and releases a mature egg later in the cycle.
As the follicle develops, estrogen levels rise. Estrogen also helps rebuild and thicken the uterine lining after menstruation.
What might you notice?
Some people notice changes in energy, cervical mucus, or mood as hormones fluctuate. However, these experiences are not the same for everyone.
Practical tip: Record your cycle length and any changes in cervical mucus. Clear, slippery mucus can occur as ovulation approaches, but it does not confirm the exact day of ovulation.
3. Ovulation Phase: When the Ovary Releases an Egg
Ovulation occurs when hormonal changes, particularly a surge in luteinizing hormone (LH), trigger the release of an egg from an ovary.
In a textbook 28-day cycle, ovulation may occur around day 14. However, the timing varies, even among people whose cycles seem regular.
Why does ovulation matter?
- The released egg can be fertilized for a limited period, generally about 12–24 hours.
- Sperm can survive in the reproductive tract for several days.
- The fertile window includes the days leading up to ovulation and the day of ovulation.
Some people notice mild one-sided pelvic discomfort or changes in cervical mucus around this time. Others experience no obvious symptoms.
Practical tip: If you are trying to conceive, cycle tracking, ovulation predictor kits, and cervical mucus observations may help estimate your fertile window. Calendar predictions alone cannot guarantee when ovulation occurs.
4. Luteal Phase: Preparing for a Possible Pregnancy
After ovulation, the emptied follicle becomes the corpus luteum, which produces progesterone. This hormone helps maintain the uterine lining so that it can support a pregnancy if implantation occurs.
If pregnancy does not occur, the corpus luteum breaks down, progesterone and estrogen levels fall, and the next period begins.
Common experiences during the luteal phase include:
- Breast tenderness
- Bloating
- Food cravings
- Headaches
- Mood changes
- Premenstrual syndrome (PMS) symptoms
Not everyone experiences PMS, and symptom severity can differ from month to month.
Practical tip: Keep a record of symptoms across several cycles. If they regularly interfere with daily life, discuss them with a healthcare professional rather than assuming they are simply something you must tolerate.
How Long Does Each Menstrual Cycle Phase Last?
The timing below is illustrative, based on a 28-day cycle. Your actual pattern may differ.
Phase | Approximate timing | Main event |
|---|---|---|
Menstrual | Days 1–5, often | Uterine lining sheds |
Follicular | Days 1–13, approximately | Follicles develop and the lining rebuilds |
Ovulation | Around day 14 in this example | An egg is released |
Luteal | Days 15–28, approximately | Progesterone supports the uterine lining |
The follicular phase overlaps with menstruation, so these day ranges are not four separate blocks. A cycle can be shorter or longer than 28 days, and ovulation may happen earlier or later.
How Can You Track Your Menstrual Cycle?
Cycle tracking can help you understand your personal pattern, estimate when your next period may begin, and identify changes worth discussing with a clinician.
Try these steps:
- Mark the first day of menstrual bleeding as day one.
- Record when bleeding ends and note its heaviness.
- Track cramps, mood changes, headaches, and other symptoms.
- Note cervical mucus changes if you are comfortable doing so.
- Compare patterns across several months.
An app or paper calendar can help. Remember that cycle tracking is not a reliable stand-alone method of contraception, and irregular cycles can make ovulation harder to predict.
When Should You Consult a Healthcare Professional?
Seek medical advice if you experience severe period pain, bleeding between periods, unusually heavy bleeding, a sudden persistent change in your cycle, or periods that stop unexpectedly. If pregnancy is possible and your period is late, consider taking a pregnancy test.
People with conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, or other hormonal concerns may have irregular cycles that need individual assessment. A healthcare professional can help identify the cause.
Supporting Your Well-Being With CalmNest Yoga
Understanding your cycle is one part of caring for your reproductive health. Gentle movement, adequate sleep, balanced nutrition, and stress-management practices may support general well-being, although yoga does not guarantee hormonal balance, regular periods, or pregnancy.
If you are pregnant and looking for pregnancy-specific movement guidance, explore Pregnancy yoga classes online. You can also read our guide to yoga asanas during pregnancy for information about pregnancy-appropriate movement.
Learn more about CalmNest Yoga and its online prenatal and postnatal wellness offerings. For questions about available sessions, visit our contact page.
Final Thoughts
The four phases of the menstrual cycle work together to prepare the body for a possible pregnancy. Understanding menstruation, follicular development, ovulation, and the luteal phase can make cycle changes easier to interpret.
Track your own symptoms rather than relying only on an assumed 28-day cycle, and consult a healthcare professional if something changes significantly or causes concern.