wellnessMarch 4, 2026

Menstrual Cycle Phases Explained

The menstrual cycle is much more than just your period. It is a complex hormonal process with four distinct phases, each affecting your body, mood, energy levels, and even workout performance differently. Understanding your cycle empowers you to work with your body rather than against it. This guide breaks down each phase and what it means for your daily life.

Understanding the Menstrual Cycle

The menstrual cycle averages 28 days but can range from 21 to 35 days and still be considered normal. It is controlled by a complex interaction of hormones including estrogen, progesterone, follicle-stimulating hormone (FSH), and luteinizing hormone (LH). The cycle has four phases: menstruation, follicular phase, ovulation, and luteal phase. Each phase has distinct hormonal patterns that affect your body in specific ways.

Phase 1: Menstruation (Days 1-5)

Menstruation marks the beginning of a new cycle. The uterine lining sheds because no fertilized egg implanted. Hormone levels (estrogen and progesterone) are at their lowest. Common symptoms include cramping, bloating, fatigue, and mood changes. Periods typically last 3-7 days with blood loss of 30-80 ml. During this phase, you may prefer lighter exercise like yoga, walking, or stretching. Iron-rich foods help replace lost iron.

Phase 2: Follicular Phase (Days 1-13)

The follicular phase overlaps with menstruation and extends until ovulation. FSH stimulates follicle development in the ovaries, and estrogen levels rise steadily. Rising estrogen boosts mood, energy, and cognitive function. This is often when you feel your best — it is an ideal time for high-intensity workouts, starting new projects, and social activities. Your pain tolerance and recovery ability are typically highest during this phase.

Phase 3: Ovulation (Day 14)

A surge in LH triggers the release of a mature egg from the ovary. Estrogen peaks just before ovulation, and you may feel your most energetic and confident. Fertility is highest during the 5 days before and day of ovulation. Physical signs include a slight rise in basal body temperature, changes in cervical mucus (clear, stretchy), and mild pelvic discomfort (mittelschmerz). This is your peak performance window for physical activity.

Phase 4: Luteal Phase (Days 15-28)

After ovulation, the empty follicle produces progesterone to prepare the uterine lining for potential implantation. If no pregnancy occurs, hormone levels drop, triggering menstruation. The early luteal phase may feel normal, but the late luteal phase (last 5-7 days) often brings PMS symptoms: bloating, breast tenderness, irritability, food cravings, and fatigue. You may want to reduce exercise intensity and focus on self-care during this time.

How to Track Your Cycle

Track your cycle using a period tracking app or calendar. Record the first day of your period (Day 1), symptoms, energy levels, and mood. Track for at least 3 cycles to identify your patterns. Note cycle length, period duration, PMS symptoms, and ovulation signs. This data helps predict your period, identify irregularities, plan for fertility, and optimize workout timing. Share cycle data with your healthcare provider during check-ups.

Track Your Period

Use our free Period Calculator to predict your next period, fertile window, and ovulation date.

Try Period Calculator

Frequently Asked Questions

What is considered an irregular period?

An irregular period means cycles that consistently fall outside the 21-35 day range, vary by more than 7-9 days between cycles, or are absent for 90+ days. Occasional irregularity is normal due to stress, travel, or illness. Persistent irregularity may indicate conditions like PCOS, thyroid disorders, or hormonal imbalances. Consult a healthcare provider if your periods are consistently irregular.

Can exercise affect my menstrual cycle?

Moderate exercise generally supports a healthy cycle. However, excessive exercise combined with insufficient calorie intake can lead to hypothalamic amenorrhea (loss of periods). This is common in endurance athletes and dancers. The female athlete triad — low energy availability, menstrual dysfunction, and low bone density — requires medical attention. Balance training intensity with adequate nutrition.

Why do I crave certain foods before my period?

Premenstrual cravings, especially for carbs and chocolate, are linked to the drop in serotonin during the late luteal phase. Carbohydrates help boost serotonin production, which may explain why your body craves them. Magnesium levels also drop before menstruation, potentially driving chocolate cravings. Eating regular, balanced meals and ensuring adequate magnesium intake can help manage cravings.