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05

Hormonal cycling

A monthly modulator of tissue, immunity, pain and autonomic tone.

The brain'scommandOvariesThyroidAdrenalsOvariesThyroid
The cycleThe responseOvariesThyroid

A schematic, not to scale — the places this mechanism works.

Part one — how this normally works

The cycle is systemic, not local

Estrogen and progesterone receptors are expressed in blood vessels, mast cells, ligaments, gut and brain. A cycle is not an event confined to the uterus; it is a monthly change in the operating conditions of several other systems.

Two phases, two states

The follicular phase is estrogen-dominant and generally pro-inflammatory in tissue terms; the luteal phase adds progesterone, raises core temperature and resting heart rate, and shifts fluid and mood.

Menstruation is an inflammatory process

Endometrial shedding is driven by prostaglandins and local inflammation. Cramping is uterine muscle responding to those signals, and the same prostaglandins reach the gut and the vasculature.

Part two — what varies between bodies

  • Sensitivity to normal hormonal shifts differs enormously between people at identical hormone levels.
  • Luteal-phase heart rate, joint laxity, migraine threshold and mast-cell reactivity all move measurably.
  • Cycle tracking often reveals a rhythm underneath symptoms that looked random.

Part three — where it diverges

This is the first place conditions get named

  • Endometrial-like tissue growing outside the uterus responds to the same signalling, producing cyclical and eventually persistent pain, adhesions and infertility — endometriosis.
  • The same tissue within the myometrium produces a heavy, boggy, diffusely painful uterus — adenomyosis, a distinct condition that often coexists.
  • Severe, cyclical mood and physical symptoms confined to the luteal phase and remitting at menses describe premenstrual dysphoric disorder, a sensitivity to normal hormone change rather than abnormal hormone levels.
  • Estrogen withdrawal is a well-described migraine trigger, and luteal shifts alter orthostatic tolerance and mast-cell reactivity.

What moves this mechanism

  • Track across at least two cycles before drawing conclusions about any treatment.
  • Prostaglandin suppression timed before onset rather than after.
  • Hormonal suppression as one option among several, with explicit goals.
  • Plan load, appointments and demanding work around known phase effects where possible.

Conditions that involve this mechanism