Why Painful Periods? The Evolutionary Story Behind Menstrual Pain
Dysmenorrhea — painful periods — affects an estimated 50–90% of women of reproductive age, and is the leading cause of school and work absence in this demographic globally. It is so common that it is often normalised as simply “what periods are like.” Evolutionary medicine challenges this normalisation with a compelling observation: this level of pain and disruption was not the ancestral norm.
The Menstrual Cycle Count
A Paleolithic woman would have experienced approximately 150 menstrual cycles in her lifetime. The rest of her reproductive years would have been spent pregnant, breastfeeding (which suppresses ovulation for 1–3 years per child), or in early childhood before menarche.
A modern woman in an industrialised country experiences approximately 450 menstrual cycles — roughly three times as many. This is not a minor variation. It is a fundamental shift in how the reproductive system is operating across a lifetime.
The uterine endometrium evolved to undergo this cycle relatively infrequently, with long periods of progesterone dominance during pregnancy and lactation providing respite. Repeated monthly cycles without these rest periods create cumulative effects that the system was not designed to sustain indefinitely.
What Excess Cycles Do
Cumulative prostaglandin exposure: The prostaglandins that drive uterine contractions for menstruation are the primary cause of cramping pain. More cycles means more cumulative exposure — and more opportunity for sensitised pain pathways to develop.
Endometrial iron exposure: Each cycle involves bleeding and iron-rich tissue breakdown. Iron is a potent oxidative stressor; repeated cycles increase oxidative burden on pelvic tissues.
Endometriosis risk: Endometriosis — endometrial tissue growing outside the uterus — is estimated to affect 10–15% of reproductive-age women and is virtually unknown in traditional populations with fewer cycles.
OQ’s Approach to Period Pain
Dysmenorrhea is not approached at OQ as simply a gynaecological symptom requiring pain management. The pelvis, sacrum, and lumbar spine form an integrated mechanical and neurological unit. Uterine, ovarian, and bowel ligaments all connect to this structure. Fascial tension, sacral mobility, and autonomic innervation of the pelvic organs are all osteopathically relevant.
Dr. Sakata works with many women in their 30s–50s who have been told “your pain is normal” and have been managing it with painkillers for years. Osteopathic assessment frequently identifies mechanical contributors — pelvic asymmetry, sacral restriction, fascial adhesions — that can be addressed with meaningful reduction in pain.
FAQ
Is painful periods normal?
Evolutionarily, significant cycle pain was not the norm. Some discomfort during shedding is understandable, but pain that requires medication or disrupts daily life is worth investigating — not simply accepted.
Can osteopathy help with period pain?
For dysmenorrhea with a mechanical or autonomic component (which is common), osteopathic treatment of the pelvis, sacrum, and lumbar spine can produce significant relief — sometimes from the first or second session.
What is the relationship between period pain and endometriosis?
Endometriosis is the most extreme end of the dysmenorrhea spectrum. It is strongly associated with the evolutionary mismatch of excess menstrual cycles, and involves both mechanical (adhesions) and immune (inflammatory) components that osteopathy can address as part of a multidisciplinary approach.
Period pain that you’ve been told is “just how it is”? It often isn’t. Let’s assess what’s actually driving it. Book →