Your Pelvic Floor & Your Cycle

If you have ever noticed that your pelvic pain, bladder control, or core stability seems to shift throughout the month, you are not imagining it. Your pelvic floor is a hormonally responsive tissue, and the same fluctuations of estrogen, progesterone, and relaxin that govern your menstrual cycle also influence the tension, strength, and sensitivity of those deep internal muscles. Yet this connection is almost never discussed, which means millions of people are managing pelvic floor symptoms without the most important piece of context: their cycle.

Understanding how your pelvic floor changes across your four phases is not just for people with pelvic pain or postpartum recovery. It is foundational knowledge for anyone who exercises, experiences period cramps, sits at a desk all day, or wants to understand why their body feels so different from week to week.

What Is the Pelvic Floor, Really?

The pelvic floor is a hammock-shaped group of muscles, ligaments, and connective tissue that spans the base of your pelvis. It supports your bladder, uterus, and rectum, plays a central role in sexual function, controls urinary and bowel continence, and works in concert with your deep core and diaphragm to manage intra-abdominal pressure.

But the pelvic floor is not a static structure. It responds dynamically to load, posture, breathing, stress, and critically, to hormonal signals. Estrogen receptors are abundant in pelvic floor tissue, and research published in the National Library of Medicine confirms that estrogen plays a major role in maintaining collagen content, elasticity, and neuromuscular function in the pelvic region. When estrogen rises and falls throughout your cycle, your pelvic floor feels it.

Phase by Phase: What Is Happening in Your Pelvic Floor

Menstrual Phase (Days 1-5 approx.)

During menstruation, estrogen and progesterone are at their lowest. The uterus is contracting to shed its lining, and prostaglandins, inflammatory signalling molecules, drive much of the cramping and pelvic heaviness you may feel. These prostaglandins do not stay neatly inside the uterus; they can also increase tension and sensitivity in the surrounding pelvic floor muscles.

For people with conditions like endometriosis or primary dysmenorrhea, this phase can involve genuine pelvic floor hypertonicity, where the muscles are bracing and holding in response to pain and inflammation. This is an involuntary protective response, but it can amplify cramping rather than relieve it.

"The pelvic floor often tightens as a guarding response to uterine pain. Teaching patients to consciously release and breathe into the pelvic floor during menstruation can meaningfully reduce cramping intensity."

- Dr. Stephanie Prendergast, MPT, Pelvic Health Specialist, Co-founder, Pelvic Health and Rehabilitation Center

What to do: Prioritise diaphragmatic breathing, gentle movement like walking or restorative yoga, and pelvic floor releases rather than activation exercises. Heat therapy on the lower abdomen can also reduce both uterine and pelvic floor tension simultaneously.

Follicular Phase (Days 6-13 approx.)

As estrogen rises in the follicular phase, tissues in and around the pelvis become better hydrated, more elastic, and better perfused with blood. Nerve sensitivity tends to normalise, and many people notice that pelvic discomfort that was present during menstruation simply resolves. Vaginal lubrication improves, and the pelvic floor can contract and relax more efficiently.

This is a genuinely good time to begin or progress pelvic floor strengthening work. Estrogen supports collagen synthesis and muscle recovery, meaning the tissue responds well to progressive load during this window. If you are working with a pelvic floor physiotherapist, this phase is ideal for introducing new exercises or increasing resistance.

What to do: Introduce or progress strengthening work. Try coordinated core and pelvic floor exercises. Pay attention to how much easier movement feels compared to the week before. This contrast is information.

Ovulatory Phase (Days 14-16 approx.)

Around ovulation, estrogen peaks sharply and a hormone called relaxin is also detectable at higher levels. Relaxin is best known for its role in pregnancy, where it loosens ligaments and joints in preparation for birth, but it is also present in smaller amounts during the mid-cycle surge and the luteal phase. Research from the National Institutes of Health confirms that relaxin levels peak around ovulation and can affect joint laxity and connective tissue throughout the body.

For the pelvic floor, this matters because increased ligamentous laxity around the sacroiliac joints and pubic symphysis can affect how load is transferred through the pelvis during exercise. Some people notice a feeling of instability, pressure, or heaviness in the pelvic region around ovulation, particularly with high-impact activities.

"Relaxin does not just affect the uterus. It affects connective tissue system-wide, and for people who are hypermobile or already dealing with pelvic girdle discomfort, the ovulatory window can be a time of increased vulnerability to loading injuries."

- Dr. Sinead Dufour, PhD, BScPT, Associate Professor, McMaster University, Faculty of Health Sciences

What to do: Enjoy your peak energy and strength, but be mindful with very high-impact or heavy loading activities, especially if you have a history of pelvic girdle pain. Focus on form and intra-abdominal pressure management. Avoid holding your breath during lifts.

Luteal Phase (Days 17-28 approx.)

After ovulation, progesterone rises significantly and estrogen drops from its peak, then rises slightly again before both fall sharply in the days before menstruation. This hormonal cocktail has complex effects on the pelvic floor.

Progesterone is a smooth muscle relaxant, which means it can slightly reduce the tone of the bladder and pelvic floor tissues. Some people experience increased urinary urgency or frequency in the luteal phase for exactly this reason. The smooth muscle walls of the bladder become slightly less toned, reducing the threshold at which urgency signals are triggered.

In the late luteal phase, as progesterone and estrogen begin to fall sharply, many people with pre-existing pelvic floor dysfunction, including conditions like vulvodynia, interstitial cystitis, or chronic pelvic pain, report a flare of symptoms. Falling estrogen means reduced tissue hydration and collagen support, increased nerve sensitivity, and a return of the inflammatory tone that will peak during menstruation.

What to do: Prioritise downtraining alongside strengthening. Address any stress or anxiety in this phase, as the nervous system directly influences pelvic floor tension. The gut-brain-pelvic floor axis means that psychological stress translates quickly into physical holding patterns in the pelvic region. Magnesium glycinate supplementation can support both nervous system calm and smooth muscle relaxation in this phase.

The Forgotten Skill: Pelvic Floor Release

Western fitness culture has fixated almost entirely on strengthening the pelvic floor, thanks largely to the ubiquity of Kegel exercise advice. But a pelvic floor that cannot release is just as dysfunctional as one that is too weak. In fact, a significant proportion of people seeking pelvic floor physiotherapy have hypertonic pelvic floors, meaning muscles that are chronically tight rather than weak.

Symptoms of a hypertonic pelvic floor can include painful periods, pain with penetration, urgency and frequency of urination, constipation, tailbone pain, and lower back tightness. If you recognise these symptoms and have been told simply to do more Kegels, it is worth seeking an assessment from a pelvic floor physiotherapist, who can determine whether strengthening or releasing is actually what your body needs.

Releases can include:

• Diaphragmatic breathing with a conscious pelvic floor drop on the exhale
• Child's pose with wide knees (yoga)
• Happy baby pose
• Supported bridge with a block under the sacrum
• Gentle squatting with a supported heel raise if needed
• Slow, mindful walking with attention to pelvic rhythm

Cycle Syncing Your Pelvic Floor Practice

Here is a practical framework for working with your pelvic floor across the month:

Menstruation: Release and Soothe

Prioritise pelvic floor release, breathwork, and heat. Avoid heavy lifting or high-impact work on your heaviest days. If you experience significant cramping, practice inhaling into the belly and consciously softening the pelvic floor on each exhale.

Follicular: Build and Progress

This is your window to advance strength work. Practice coordinated Kegels, functional core exercises, and progressive loading. Your tissue is resilient, hydrated, and recovery-ready.

Ovulation: Move Joyfully, Protect Your Foundation

Enjoy your physical peak, but pay attention to breath and bracing technique, especially in high-intensity or weighted exercise. Support your pelvic girdle with conscious engagement rather than bearing down.

Luteal: Balance Effort with Recovery

Maintain your practice but incorporate more downtraining. Watch for urgency symptoms and respond with bladder retraining strategies if needed. In the late luteal phase, lean into restorative movement and address nervous system load as a pelvic floor strategy.

When to See a Pelvic Floor Physiotherapist

Many pelvic floor symptoms that people consider inevitable, such as leaking when sneezing, painful periods, or discomfort with sex, are actually treatable with the right support. You do not need to have had a baby to see a pelvic floor physiotherapist. Pelvic floor dysfunction can affect people of all ages and reproductive histories.

Consider seeking an assessment if you experience:

• Leaking urine or urgency that feels out of control
• Pelvic pain that varies with your cycle
• Pain with tampon use, penetration, or gynecological exams
• Persistent lower back or tailbone pain
• Pressure or heaviness in the pelvis, particularly after standing

A pelvic floor physiotherapist can perform an internal and external assessment to identify whether your primary issue is weakness, tightness, coordination problems, or a combination, and create a plan that is specific to your body and your cycle.