Why Your Joints, Tendons, and Pelvic Floor All Feel Different in Perimenopause

If you’re in your late 30s, 40s, or early 50s and you’ve noticed your body suddenly behaving like it belongs to someone else — achy tendons that never used to bother you, a pelvic floor that feels weaker or more reactive, shoulders that seem to “catch,” a general sense of stiffness you can’t stretch away — you’re not imagining it, and you’re not just “getting old.” There’s a specific, well-documented biological reason this cluster of changes tends to show up together, and it comes down to one molecule: collagen.

This post is the hub for a short series on perimenopause and the body’s structural systems. We’ll explain the underlying mechanism here, and then go deep on three areas it affects most: the pelvic floor, the breathing/core system, and tendons.

Estrogen Is a Collagen Hormone

Most people think of estrogen purely in terms of the reproductive system or hot flashes. But estrogen receptors are found throughout connective tissue in tendons, ligaments, fascia, skin, and the pelvic floor, because estrogen plays a direct role in collagen synthesis and turnover.,

Collagen is the structural protein that gives tendons their tensile strength, gives skin its elasticity, and gives the pelvic floor and fascia their ability to both support and stretch. As estrogen levels become erratic and then decline through perimenopause, collagen production slows and existing collagen becomes less well maintained. Research has found that women can lose a meaningful percentage of skin collagen in the first five years after menopause begins, and tendons and ligaments, which are made of the same basic material, are affected in parallel, even though they’re less visible than skin.

This is not a one-organ problem. It’s a whole-body materials problem.

Why This Shows Up as a Cluster, Not a Single Symptom

Because collagen is everywhere, its decline doesn’t announce itself as one clean diagnosis, it shows up as a scattered set of complaints that often don’t get connected to each other, or to hormones, in a typical doctor’s visit:

• Tendons become less resilient and more prone to irritation and slow-healing injuries (tendinopathy), even in people who haven’t changed their activity level.
• The pelvic floor, which is a sling of muscle and connective tissue, can lose some of its support capacity, contributing to new or worsening symptoms like leaking, pressure, or urgency.
• The diaphragm and deep core system — which work as a pressure-management unit with the pelvic floor — can lose coordination, partly due to connective tissue changes and partly due to changes in breathing mechanics under stress.
• Joints and fascia can feel stiffer or less “springy,” and injuries that used to resolve in two weeks might now take six.

Individually, each of these might get treated as an isolated, unrelated issue. Understood together, they’re a coherent picture of what declining and fluctuating estrogen does to the body’s structural tissue.

It’s Not Just Collagen, Inflammation and Tissue Repair Change Too

Estrogen decline doesn’t only slow collagen production; it also shifts the body’s inflammatory environment and the efficiency of tissue repair. Estrogen has anti-inflammatory properties in tissue, and its decline is associated with a more pro-inflammatory baseline state. This partly explains why perimenopausal and postmenopausal people often report that injuries, a tweaked Achilles, a cranky rotator cuff, take noticeably longer to calm down than they used to, and why “overuse” injuries can appear even without a clear overuse event.

This Is Not a Reason to Do Less

It’s tempting, once you understand this, to read it as “my body is falling apart, I should be more careful and do less.” The research actually points the other way. Mechanical loading, resistance training, in particular, is one of the few interventions shown to stimulate collagen synthesis and help tendons and connective tissue adapt, even in a lower-estrogen environment. The pelvic floor, similarly, responds to targeted strength and coordination work, not rest. Under-loading connective tissue in perimenopause tends to accelerate the problem, not protect against it. 

The nuance is in how you load it: appropriately progressed strength training tends to help; sudden spikes in high-impact or high-intensity training without a base tend to be where tendinopathies show up. Want to learn more about mechanical loading? Read this article to learn how to reload your tissue to heal.

Does This Resonate With You?

If any of this sounds familiar, new aches, a pelvic floor that doesn’t feel like it used to, or a tendon that just won’t calm down, you don’t have to figure it out through trial and error. Book an appointment with our team here in Kingston, ON, and we’ll help you sort out what’s actually going on and build a plan around it, whether that’s pelvic floor physiotherapy, a tendon-specific loading program, or general strength and movement support for this stage of life.