By: Dr. Lauren Hutson MD MBA, Functional Medicine Physician
After my podcast with Noa Sutherland yesterday I wanted to elaborate on Cortisol just a bit more because its been given sucha. Bad wrap but in actuality you need it to survive. Don't let anyone tell you otherwise!
Have you ever caught yourself saying, “I just don’t feel like myself lately”. Even when your labs come back "normal," your lifestyle looks "fine" on paper, and you’re technically “healthy”?
You’re not alone.
For so many women starting in their early 30s, there’s a common, often overlooked culprit behind symptoms like brain fog, stubborn weight gain, irritability, low libido, poor sleep, and irregular cycles: cortisol.
What Is Cortisol?
Cortisol is your body's primary stress hormone, produced by the adrenal glands in response to signals from your brain's hypothalamus-pituitary-adrenal (HPA) axis. It’s part of your survival mechanism; designed to help you respond quickly to danger, regulate inflammation, stabilize blood sugar, and maintain energy balance.
But what happens when your stress response never shuts off?
In our modern world, most stress isn’t from running from a tiger; t’s from emails, unpaid bills, hormone-disrupting foods, lack of sleep, too much screen time, overexercising, or unresolved trauma. This chronic low-grade stress keeps cortisol chronically elevated or eventually suppressed, disrupting your entire system.
How Cortisol Disrupts Your Body
1. Hormones & Your Cycle
Chronic stress and high cortisol levels suppress the production of gonadotropin-releasing hormone (GnRH), which interferes with ovulation and sex hormone production. The result? Irregular periods, PMS, infertility, or feeling disconnected from your cycle.
A study published in the journal Fertility and Sterility found that women with high stress and elevated cortisol had a 62% lower chance of conceiving per cycle compared to women with normal levels.
2. Thyroid Dysfunction
Cortisol directly inhibits the conversion of T4 to T3, your body’s active thyroid hormone. If you feel cold, tired, constipated, or foggy but your labs say you're “within range,” cortisol may be the missing piece.
According to a review in the journal Endocrine Reviews, chronic stress has been shown to reduce T3 levels even when TSH and T4 are normal, a pattern frequently missed in conventional labs.
3. Gut-Brain Axis
Cortisol weakens the intestinal lining, leading to leaky gut and food sensitivities. It also reduces digestive enzyme production, impairing nutrient absorption and contributing to bloating and IBS-like symptoms.
In one 2020 study in Frontiers in Psychiatry, women with elevated cortisol reported significantly higher rates of GI distress, which correlated with alterations in their gut microbiota.
4. Brain Health and Mood
High cortisol shrinks the hippocampus, the part of your brain responsible for memory and emotional regulation. This is why you may feel more anxious, irritable, depressed, or “off” mentally when your stress levels are high.
Research from Yale University showed that chronic cortisol elevation leads to structural changes in brain volume and is associated with higher rates of anxiety and depressive symptoms.
The Neurofeedback Loop: When One System Affects the Next
Your body operates in an interconnected loop, and cortisol sits right at the center.
When cortisol is dysregulated, it doesn’t just affect one organ; it creates a cascade:
High cortisol → suppresses progesterone → worsens PMS
High cortisol → poor sleep → worsens insulin resistance
High cortisol → weakens gut lining → increases inflammation
High cortisol → depletes DHEA → reduces libido and mood
High cortisol → suppresses melatonin → disrupts circadian rhythms
And once you’re stuck in the loop, it can feel nearly impossible to “just snap out of it.”
How Do We Fix This?
At Austin Medicine Clinic, we don’t tell you to just “stress less.” We identify the root.
Your symptoms are data, not defects.
Here’s how we begin:
Test, Don’t Guess
4-point salivary or urine cortisol testing to map your curve
Full thyroid panel, including free T3, reverse T3, and antibodies
Sex hormone testing (estradiol, progesterone, DHEA, testosterone)
GI and micronutrient assessments if needed
Rebalance Your Nervous System
Neurofeedback, HRV training, and breathwork
Magnesium glycinate or L-theanine to calm HPA overactivation
Herbal adaptogens like ashwagandha or rhodiola (tailored to your pattern)
Nourish to Repair
Stabilize blood sugar with protein-rich, anti-inflammatory meals
Remove processed foods and inflammatory oils (like canola and soybean)
Support circadian rhythm with morning light and nightly wind-down routines
Final Thoughts
If you’re in your 30s, exhausted, and not feeling like yourself, even though “nothing is wrong”.
Cortisol may be the missing link, and you don’t have to live in survival mode.
Want to start testing your cortisol and restoring balance? Book a consult with our team at Austin Medicine Clinic. You deserve to feel like yourself again; maybe even better.
Meet the Author
Dr. Lauren Hutson is an experienced Primary Care Provider with degrees in Neuroscience and Biology from University of Texas at Austin. She completed her residency at Baylor Scott and White, Texas A&M, and has a strong focus on preventive care and chronic illness management. During the pandemic, she provided critical care as a Hospitalist in New Mexico, exemplifying her commitment to holistic, patient-centered care.
