Why Do I Feel So Completely Worn Out by Stress — What Is 'Allostatic Load' and How Does It Affect Perimenopause?

I used to think my resilience had just… broken. The smallest bit of stress felt like a tidal wave, and the exhaustion was so deep it had its own zip code. I wasn't just tired; I was completely worn out.

There’s a name for this wear-and-tear: ‘allostatic load.’ It’s the cumulative burden on your body from the effects of chronic stress. The link between allostatic load and perimenopause is significant; shifting hormones can lower our natural buffer against this load, making us feel profoundly overwhelmed by things we once handled. It’s not you—it’s your biology.

So, what exactly is allostatic load?

Imagine carrying a backpack every day. Each stressor—a looming deadline, a bad night’s sleep, an argument, even just worrying about the future—is a small stone you put inside. For years, you could carry it. But when you never get a chance to take the backpack off and empty it out, the weight becomes immense. That’s allostatic load.

It's the measurable, physical result of your body being in a constant state of high alert, a sign of HPA axis overload. This isn't just a feeling. It’s a real physiological state that’s influenced by our sex, age, work environment, and sleep rhythms. When this goes on for too long, it can lead to what many call burnout—a state of total emotional, physical, and mental exhaustion. It’s not a personal failure. It's a biological burden.

Why does perimenopause make it feel so much heavier?

This is the piece of the puzzle I was missing for years. Perimenopause isn’t just about night sweats. Our fluctuating hormones, especially estrogen and progesterone, play a huge role in how our brain and body regulate cortisol and respond to stress. Our internal shock absorbers just aren't as bouncy as they used to be.

Suddenly, the backpack feels ten times heavier. The stress you once managed now feels completely debilitating. The science is finally catching up to what so many of us are feeling. A 2021 study, for instance, found that perimenopausal women dealing with migraines were more likely to have a higher allostatic load. It shows a real connection between our neurological health and the body’s total stress burden during this time.

And it's complicated—you can't just address one thing and expect it all to get better. A recent 2024 longitudinal study even found that, for the women in that specific trial, using hormonal products didn't have a statistically significant effect on the trend of their allostatic load. Now, this absolutely doesn't mean hormone therapy isn't helpful for other symptoms. What it does suggest is that managing this deep, cumulative wear-and-tear requires a broader approach. Other factors may also be at play. For example, some older research has suggested a possible link between lower serum vitamin D concentrations and higher allostatic load, though more studies are needed to understand this relationship.

What This Means for You

Honestly? The most powerful thing is just knowing this has a name. You are not failing. You are not broken. You are a woman in midlife whose body is navigating a massive hormonal shift on top of decades of accumulated stress. Of course you’re exhausted.

Giving this feeling a name—allostatic load—can be the first step in taking away the self-blame. It shifts the focus from "what's wrong with me?" to "how can I support my body right now?" It’s not about finding a quick fix, but about looking for small, consistent ways to help lighten that backpack. It’s about giving yourself grace and recognizing the incredible load you’ve been carrying.

Written by Glomend Team | Last Updated: 2026-12-14

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.