The Menstrual Cycle's Phases — Physiology and Hormonal Pattern

Understanding cycle physiology lets you place individual complaints in context. This lesson covers the four phases and their hormonal pattern.

The standard 28-day cycle

The 28-day textbook cycle is an average; real cycles range typically from 21-35 days. The phases:

**Menstrual phase (days 1-5 typically).** Bleeding. The endometrial lining shed because pregnancy didn't occur in the previous cycle.

**Follicular phase (days 5-14 typically).** Estrogen rises. Follicles in the ovaries mature. Endometrium rebuilds. The dominant follicle prepares for ovulation.

**Ovulation (around day 14).** The egg releases. Estrogen peaks just before; LH (luteinizing hormone) surge triggers release.

**Luteal phase (days 14-28 typically).** Progesterone rises (from the corpus luteum that forms after ovulation). Estrogen second peak. Endometrium thickens and prepares for possible implantation.

**If no implantation:** Progesterone falls; menstruation begins; cycle restarts.

The hormones in brief

**Estrogen.** Produced primarily by ovaries. Rises through follicular phase. Drops at menstruation. Has effects beyond reproduction: bone health, cardiovascular, skin, mood, cognition. Cycles of estrogen pattern matter for many health aspects.

**Progesterone.** Produced primarily by corpus luteum after ovulation. Stabilizes luteal phase. Calming effect on the nervous system in many women. Drops at menstruation.

**Testosterone.** Lower levels than in men but real. Affects libido, energy, muscle mass.

**FSH (follicle-stimulating hormone).** Stimulates follicle development.

**LH (luteinizing hormone).** Triggers ovulation.

What "normal" variation looks like

**Cycle length:** 21-35 days. Most women's cycles fall in this range. Significantly shorter or longer is worth noting.

**Bleeding duration:** 3-7 days typical. Significantly longer or heavier may indicate underlying issues.

**Flow:** Variable. Most women find their pattern; significant changes from baseline are worth noting.

**Spotting:** Variable. Mid-cycle spotting (around ovulation) is common; spotting outside expected times is worth noting.

**Symptoms:** Mild PMS symptoms (mood shifts, breast tenderness, mild cramping) are common; severe symptoms indicate need for support.

How tissue states correlate with cycle patterns

**Cold tissue state correlation:** Often shorter cycles with light flow. Cold reproductive tissue may also correlate with decreased libido, dry mucous membranes.

**Hot tissue state correlation:** Often heavier flow, more painful cramping, more PMS irritability.

**Damp tissue state correlation:** Often longer cycles with thicker mucus patterns, sometimes fibroids history.

**Dry tissue state correlation:** Often light flow, dry mucous membranes, sometimes shorter cycles.

**Tense tissue state correlation:** Severe cramping, PMS with intense irritability, sometimes irregular cycles.

**Lax tissue state correlation:** Heavy bleeding, sometimes prolapse considerations.

The tissue-state assessment from the energetics course applies directly here.

Tracking the cycle

For clients to understand their pattern, tracking helps:

**Calendar method:** Mark first day of bleeding each month. Over 3-6 months, the cycle pattern emerges.

**Symptom tracking:** Note significant symptoms day-by-day across the cycle. Patterns reveal themselves.

**Body temperature tracking:** Basal body temperature shifts slightly with ovulation. Useful for fertility awareness.

**Cervical mucus observation:** Changes throughout the cycle; useful for understanding fertility windows.

Apps and journals support tracking. The discipline of recording reveals patterns invisible without records.

When to refer

**Cycles consistently shorter than 21 days or longer than 35 days.** Particularly if a new pattern after years of regularity.

**Bleeding more than 7 days consistently.** Or significantly heavier than typical for the client.

**Severe pain that interferes with daily activities.** Beyond mild cramping.

**Bleeding between periods consistently.**

**Significant flow changes after years of stability.**

**Postmenopausal bleeding (any bleeding after 12+ months without a period).** Always requires evaluation.

These are medical evaluation situations, not herbal-support-alone situations.

What to carry forward

Reflect on the cycle of women in your life (or yourself). What patterns emerge? What feels normal? What feels worth noting?

Next lesson, premenstrual patterns.