When most people hear “menstrual cycle”, they hear “bleeding”. But your period is only one of the events of the cycle – and not even the most important one, I argue. The cycle has 4 distinct phases, each ruled by different hormone cocktails that directly influence your whole body, your behaviors, mood, energy levels, libido–basically, every cell in your body.

Understanding these phases is crucial not only to your reproductive health, but to your overall health. It’s about understanding the biological aspects of your female anatomy and physiology (body literacy), becoming more conscious of how your actions and environment influence your cycles (self-awareness), and learning ways to support yourself in each phase (self-care).

In sum – when you know what’s happening in your cycle, you can better care for yourself, work with your energy, and spot health patterns that matter.

This guide breaks down the menstrual cycle into four phases — menstrual, follicular, ovulatory, and luteal — and offers practical insights to help you navigate each one with clarity and ease.

What Is the Menstrual Cycle?

The menstrual cycle is what prepares the body for a potential pregnancy. It’s measured from the first day of one period to the day before the next period starts. On average, a cycle lasts 28 days (for fully matured cycles), though anything from 24–35 days is considered normal.

Three glands operate the hormones that play a main role throughout the female reproductive cycle: the hypothalamus, the pituitary, and the gonads (ovaries). They signal to each other which substances to produce, in what levels, and when. These are mainly GnRH (gonadotropin releasing hormone), follicle-stimulating hormone (FSH), luteinizing hormone (LH), estrogen, progesterone, and a little bit of testosterone.

This cocktail of hormones is what successfully matures and releases the egg in each cycle. The sex hormones also help with the production of cervical mucus – a substance produced in the cervix that helps with conception – and to prepare the uterine walls to receive and nourish the embryo. If pregnancy doesn’t happen, the uterine lining is released and the process begins again.

Phase 1: Menstrual (Cycle days 1–5, on average)

What’s happening physically:

• The uterine lining sheds, resulting in bleeding (your period).
• Hormone levels are at their lowest.

How you might feel:

• Energy may be low; you may need rest.
• Emotionally you may feel tender or introspective.

How to support yourself:

• Prioritize rest and gentle movement (like stretching, walking, or yoga).
• Give yourself permission to slow down.

Compassionate reminder:

This phase isn’t just an inconvenience — it’s your body’s natural reset. Treat yourself with the same care you’d offer a friend going through something physically demanding.

CURIOUS FACT: Have you ever wondered why women menstruate? In Dr. Sarah E. Hill’s book “This is your brain on birth control: the surprising science of women, hormones, and the law of unintended consequences”, she explains the evolutionary reason of human menstruation. While most other female mammals reabsorb their endometrial lining, humans have the “luxury” of shedding our lining every single month. She explains that our bodies evolved in environments where food wasn’t always accessible as it is today, and because of that, we needed to choose very carefully which embryos would have a good chance of surviving in this rough environment.

She goes on to say that human pregnancy and childbirth are highly expensive for the body–another reason why we don’t make babies as easily. In her words, “the costs of investing in the wrong pregnancy are higher for human females than for those of other species.” In spite of what we might think, the uterine lining is not a cozy blanket that embraces the embryo at any cost. It’s actually very hard for those embryos to implant in the uterus wall. If they are not as quick to do so, there’s only a few days left before menstruation is triggered. This avoids that some undeveloped or defective embryo sticks around for too long. It’s estimated that 32% of fertilized eggs fail to implant and are passed with the following menstruation. 

Phase 2: Follicular (Cycle days 6–13, on average)

What’s happening physically:

• FSH stimulates follicles in the ovaries to mature.
• Growing follicles produce Estrogen.
• Rising Estrogen thickens the uterine lining.
• One dominant follicle continues developing, preparing the oocyte for ovulation.

How you might feel:

• Rising energy, outgoing, optimistic.
• Greater focus and motivation.
• Creative ideas may flow more easily.

How to support yourself:

• Lean into planning, goal-setting, and trying new things.
• Experiment with more vigorous movement if it feels good.

Compassionate reminder:

This phase is often described as a “springtime” — a fresh start. Let yourself feel the renewal, but don’t pressure yourself to be overly productive.

Phase 3: Ovulatory (Cycle days 14–16, on average)

What’s happening physically:

• Estrogen peaks, and cervical mucus becomes clear and stretchy, supporting fertility.
• A surge of LH happens 1 to 2 days before ovulation.
• The LH peak triggers the egg to be released from the ovary.
• The egg is picked up by the fimbriae (the finger-like structures at the end of the fallopian tube), and travels down the tube into the uterine cavity.

How you might feel:

• Energy and self-confidence often peak.
• You may feel more social, communicative, and outwardly focused.
• Libido can naturally rise.

How to support yourself:

• Schedule important conversations, networking, or social events if possible.
• Engage in workouts that feel fun and active.

Compassionate reminder:

This phase is a natural time of expression and connection. Enjoy it, but remember it’s okay if your experience doesn’t match the “textbook” description — every body is unique.

Phase 4: Luteal (Cycle days 17–28, on average)

What’s happening physically:

• The now empty follicle turns into the corpus luteum, a gland-like tissue that produces progesterone.
• Progesterone stabilizes the growth of the uterine lining and stimulates the secretion of substances that support pregnancy.
• If no pregnancy occurs, progesterone drops by the end of the luteal phase, triggering the next period.

How you might feel:

• In the first half: calm, grounded, and focused.
• In the second half: possible mood shifts, PMS symptoms, or fatigue as hormones drop.

How to support yourself:

• Focus on finishing tasks and tying up loose ends.
• Allow space for rest and emotional care, especially in the premenstrual days.

Compassionate reminder:

The luteal phase often gets a bad reputation because of PMS, but it can be supported with optimal progesterone production and proper estrogen detoxification. Honor your limits, and don’t hesitate to slow down as your body prepares for a new cycle.

Why Understanding the Four Phases Matters

Knowing your cycle phases isn’t about control — it’s about connection.

Here’s why it matters:

• Self-awareness: You’ll recognize patterns in mood, energy, and health. Knowing how your specific body reacts on each phase helps you plan key events around them.
• Health insights: Cycle irregularities, severe PMS symptoms, period pain, missing or delayed ovulation, among others, can be early signs of health issues. Cycle charting with Fertility Awareness brings clarity and helps normalize your cycles.
• Body confidence: You’ll feel safer and more at ease in your own rhythms when you understand what your body is doing and what it needs in order to do it properly.
• Natural birth control: Understanding how to read your fertility signs with the sympto-thermal method I teach is a 99.4% effective hormone-free contraception method, and can also help you increase chances of pregnancy.

Common Misconceptions About the Menstrual Cycle

1. “Every cycle is 28 days long.”

Normal cycles for a mature cycle (excluding the first 2 years after menarche and the menopause transition years) can range from 24 to 35 days. This depends on how long you take to ovulate (follicular length) and how long your luteal phase is.

2. A 28-day cycle is the healthiest.”

Not necessarily. Although the average of mature cycles is 29 days, that doesn’t necessarily mean that every cycle that is 29 days is healthy. Cycle health is measured by a number of factors, such as the length of the luteal phase, cervical mucus production, PMS symptoms, painful periods, bleeding volume and length, among others.

3. “PMS is inevitable and always severe.”

Although common, PMS symptoms should not impair your ability to function normally. If you’re feeling depressed, anxious, irritable, fatigued to a point where it becomes too difficult for you or the people around you, it may signal an underlying health issue. It is normal to feel less energized, teary, and irritable, but it shouldn’t interfere with your relationships, work life or cause mental health issues. 

4. “You can get pregnant any day of the cycle.”

Absolutely not. On the contrary, the egg only survives for 24h after it’s released, and there are only a few extra days before and after ovulation when sperm could survive in the presence of cervical mucus. 

5. “Period pain is normal, everybody has it.” 

Period pain that is more than a 2 or 3 on a pain scale should not be considered normal. If you require medication every cycle, or if your pain is debilitating, investigating the cause of the pain and taking action to address it is paramount. Unfortunately, women’s period pain is not taken seriously enough by conventional medicine. Educate and advocate for yourself, and know that it is possible to have pain-free periods!

Final Thoughts: Embrace Your Natural Rhythms

Your menstrual cycle isn’t just the result of a bunch of hormones swimming in your bloodstream. It’s a monthly health report that reflects your whole state of being—spiritual, emotional, physical, mental. By understanding its four phases, you can meet yourself exactly where you are, with more compassion and clarity. This empowers you to give your body and soul what they need in each phase of the cycle, and slowly progress to more harmonious and healthier periods.

Written by

Carol da Selva