Why your pain changes with your menstrual cycle: what hormones are actually doing

Have you ever noticed that your back aches more in the days before your period? That your joints feel heavier, your neck tighter, or that pain you normally manage just fine suddenly feels much harder to cope with? And then, a few days into your cycle, it eases again?

You are not imagining this. You are not being dramatic. There is a real, scientifically understood mechanism behind it. And understanding what is happening in your body can make a meaningful difference to how you manage your health, and how you make sense of your experience when you walk through a clinic door.

This article explains, in plain language, what estrogen and progesterone actually do to pain sensitivity across your menstrual cycle, why your nervous system responds differently at different points in the month, and what all of this means for your musculoskeletal health.

First: pain is not just about damage

Before we talk about hormones, it helps to understand something fundamental about how pain works.

Pain is not simply a signal that travels from an injured or inflamed tissue up to your brain like a telephone call. Pain is something your nervous system produces as a protective response. It is an output, not just an input. The same tissue state can produce more or less pain depending on the context, the meaning your brain assigns to it, and how sensitised your nervous system currently is (Moseley & Butler, Explain Pain Supercharged, 2017).

This is not a psychological dismissal. It is neuroscience. Your nervous system is constantly making decisions about threat level, and it uses every available piece of information to do that, including the hormonal environment it is operating in.

Which is why hormones matter. Considerably.

Your menstrual cycle: a brief map

The average menstrual cycle runs approximately 28 days, though significant variation is normal. Understanding where you are in that cycle is the foundation for understanding why you feel the way you do.

What estrogen actually does to pain

Estrogen's relationship with pain is genuinely complex. It is not simply pro-pain or anti-pain. It acts differently depending on concentration, timing, receptor type, and the tissue being affected. The broad pattern, with significant individual variation, is that when estrogen is at moderate to high levels it tends to support better pain tolerance. When estrogen falls sharply, pain sensitivity tends to rise (Iacovides, Avidon & Baker, European Journal of Pain, 2015).

Here is why.

Estrogen receptors are distributed extensively throughout the central nervous system, including in the amygdala, thalamus, and the anterior cingulate cortex, all regions involved in pain processing and emotional response to pain (Chen, Zhang, Sadana & Chen, Biology of Sex Differences, 2021). This means estrogen does not merely act on peripheral tissues. It actively modulates how the brain perceives and processes threat signals.

Estrogen also influences the descending pain inhibitory pathways. These are the brain and spinal cord systems that act like a volume control on incoming pain signals, turning them up or down depending on context, stress level, and physiological state. Research examining women undergoing estrogen deprivation through aromatase inhibitor treatment found that lower estrogen levels were associated with impaired function of these descending inhibitory pathways, meaning the natural braking system on pain became less effective (Henry et al., The Journal of Pain, 2014).

Estrogen also modulates serotonin and dopamine pathways and enhances endogenous opioid function, the body's own pain-dampening chemistry, both of which are deeply involved in how we experience and respond to pain (Iacovides, Avidon & Baker, 2015).

So during the follicular phase, as estrogen rises toward its peak, many women find their pain tolerance improves, their recovery from physical loading is better, and their mood is more stable. This is not coincidence.

What progesterone does, and why the luteal phase matters

Progesterone is produced primarily in the second half of the cycle by the corpus luteum following ovulation. Its relationship with pain is nuanced and should not be oversimplified.

In acute contexts, progesterone can have analgesic properties. It has been shown to raise pain thresholds in animal models of neuropathic and inflammatory pain, an effect that appears to involve both direct progesterone receptor signalling and conversion to the neuroactive metabolite allopregnanolone, which acts on GABA-A receptors (Joshi, Williamson, Moosa & Kapur, The Journal of Pain, 2024).

However, in the broader context of the human menstrual cycle, the picture is more complex. Research has found significant negative correlations between rising progesterone levels and both ischemic pain threshold and pressure pain tolerance during the early luteal phase. As progesterone rises, tolerance to pressure and ischemic pain decreases in some women. The mechanisms behind this are not fully established, and results across studies are not entirely consistent (Rezaii, Linden Hirschberg, Carlstrom & Ernberg, The Journal of Pain, 2012).

Crucially, it is not simply a case of progesterone being pro-inflammatory. The more important clinical picture is what happens at the end of the luteal phase: as both estrogen and progesterone fall sharply together, the nervous system loses the modulating influence of both hormones simultaneously. It is this combined hormonal withdrawal, not the presence of progesterone per se, that appears most closely linked to the increased pain sensitivity many women experience premenstrually (Iacovides, Avidon & Baker, 2015).

Research examining pain sensitivity and electrical thresholds across the menstrual cycle found increased pain sensitivity and lower sensory thresholds toward the end of the cycle. As summarised by Morales-Lalaguna et al. (2025, Healthcare), this hormonal withdrawal is associated with exacerbated premenstrual symptoms including increased pain experience.

Prostaglandins: the inflammatory amplifier at menstruation

When the luteal phase ends and menstruation begins, the shedding endometrium releases prostaglandins, specifically prostaglandin E2 (PGE2) and prostaglandin F2-alpha (PGF2alpha), in significant quantities.

Prostaglandins are potent inflammatory signalling molecules. In the context of menstruation, they cause uterine muscle contractions, which we experience as cramps. But their effects do not stay neatly localised to the uterus.

Prostaglandins are well established as peripheral sensitisers. They lower the threshold at which sensory nerve endings fire through receptor interactions that increase the sensitivity of ion channels on sensory nerve fibres, particularly via the TRPV1 pathway (Moriyama, Higashi, Togashi et al., Molecular Pain, 2005). This means tissues that would not normally generate significant pain signals begin to do so at lower levels of pressure, stretch, or movement.

This is one reason why, during menstruation, previously manageable back pain or hip aching can feel disproportionately worse. The nervous system is operating in a heightened inflammatory state. This is peripheral sensitisation, a real, measurable biological phenomenon, not a perception problem or a pain tolerance issue.

It also explains why NSAIDs such as ibuprofen reduce menstrual pain: they work by inhibiting the cyclooxygenase enzymes that produce prostaglandins, reducing peripheral sensitisation at source (Iacovides, Avidon & Baker, Human Reproduction Update, 2015).

The nervous system's changing set point

Research suggests that in several chronic pain conditions, including fibromyalgia, temporomandibular disorders, migraine, rheumatoid arthritis, and irritable bowel syndrome, symptoms may fluctuate across the menstrual cycle, with many studies pointing toward worsening in the late luteal and early follicular phases. Findings are not uniform across all studies, and much of this evidence is drawn from women with existing chronic pain conditions rather than pain-free populations (Iacovides, Avidon & Baker, 2015).

This reflects the way the entire hormonal milieu shifts the nervous system's sensitivity threshold across the month. The nervous system does not operate as a fixed, stable instrument. It is dynamic. Its sensitivity changes in response to hormonal context, sleep, stress, previous pain experience, and immune activity.

This has important clinical implications. If you are being assessed for musculoskeletal pain and your symptoms are tracked or evaluated at a single point in your cycle, the picture your clinician gets may be incomplete. Phase of cycle is a clinically relevant variable that is often not documented.

Why women experience more chronic pain than men

This topic deserves its own full discussion, but it is worth noting here because the menstrual cycle context is directly relevant.

The body of evidence is now well established: women are at increased risk of developing chronic pain conditions, and many report more severe and frequent pain experiences than men for equivalent conditions (Bartley & Fillingim, British Journal of Anaesthesia, 2013). Musculoskeletal disorders are also systematically more prevalent in women than in men (Wijnhoven, de Vet & Picavet, Clinical Journal of Pain, 2006).

These differences are not purely cultural or psychological, though psychosocial factors certainly play a role. They reflect real biological differences in how the immune system, nervous system, and hormonal environment interact. Emerging research suggests that pain mechanisms in females are sustained through different immune pathways than in males, with adaptive immune signalling including T-cell pathways playing a more prominent role in women (Vanneste, Castejon-Espana, Arulchelvan & De Ridder, Frontiers in Neurology, 2026). Pain in women is not simply the same as pain in men but more intense. The underlying mechanisms are genuinely different.

What this means for your musculoskeletal health

Your pain is not imaginary or exaggerated. If it feels worse in the premenstrual window or at the start of your period, there is a biological explanation rooted in measurable changes to your hormonal environment and nervous system sensitisation.

Tracking your cycle alongside your pain can be genuinely useful. Many patients find that once they recognise the pattern, that their pain reliably worsens in a particular phase, it becomes less threatening. Understanding that the increase is transient and physiologically driven, rather than a sign of something getting structurally worse, can significantly reduce the fear response that amplifies pain further. If you would like to explore the broader relationship between how your nervous system produces pain and what maintains it, our article on pain science covers this in detail.

Whole-person assessment matters. An osteopathic approach considers the full picture, not just where something hurts, but what context that pain sits within. Hormonal variation is part of that context. If you come in for assessment during a high-sensitivity phase, a good clinician should take that into account when forming their understanding of your presentation.

Loading and activity may need phase-sensitive adjustment. Research in sports science and rehabilitation is increasingly interested in how menstrual cycle phase affects tissue tolerance, neuromuscular performance, and recovery from loading (Morales-Lalaguna et al., 2025). This is relevant not just for athletes. It matters for anyone trying to manage pain while maintaining activity.

You are not broken. A nervous system that responds to hormonal shifts with altered sensitivity is doing exactly what nervous systems do. The goal of good clinical care is to support you through that, not to suggest that the variability is a fault that needs fixing.

A note on hormonal contraception

This article has focused on the natural hormonal cycle. If you are using hormonal contraception, the pill, hormonal IUD, implant, or injection, your hormonal profile across the month will be different. Some women find that hormonal contraception stabilises their pain patterns; others find it makes no difference or in some cases worsens them. The research in this area is nuanced and the picture varies considerably between individuals. If you have noticed a significant change in your pain experience since starting or stopping hormonal contraception, this is worth discussing with your GP or a specialist with relevant expertise.

Frequently asked questions

David Feherty

Registered Osteopath and Principal at Osteopath Blackpool. In clinical practice since 1999. Postgraduate training with the Sutherland Cranial College of Osteopathy.

BOst (Hons) GOsC No. 11669 TPI Certified iO Member STA Member