Why Am I Having Hot Flashes?
What Is Happening in My Body?
Hot flashes are one of the most common symptoms of perimenopause and menopause. They are caused by changes in the communication between your ovaries and brain.
One key hormone involved — that most people never hear about — is inhibin.
What Is Inhibin?
Inhibin is a hormone made by the cells surrounding your eggs (granulosa cells) inside the ovaries.
Its role:
It tells your brain to reduce production of FSH (follicle-stimulating hormone).
It helps keep your reproductive hormones stable and predictable.
Think of inhibin as a “brake pedal” in your hormone system.
What Changes in Perimenopause?
As ovarian follicles decline with age:
Inhibin production drops.
The “brake” on FSH weakens.
FSH rises.
Estrogen levels become unstable and fluctuate.
These rapid hormone swings — especially sudden drops in estrogen — are what trigger hot flashes.
Why Do Estrogen Fluctuations Cause Hot Flashes?
Your brain contains a temperature control center (the hypothalamus).
Estrogen helps regulate this thermostat.
When estrogen drops quickly:
The thermostat becomes overly sensitive.
Small internal temperature shifts trigger a heat-release response.
Blood vessels dilate.
You feel sudden warmth, flushing, sweating, and sometimes a racing heart.
Chills may follow.
This is called a vasomotor symptom.
Hot flashes are not simply “low estrogen.”
They are usually caused by rapid estrogen changes.
Why Is My FSH High?
High FSH is a sign that:
Inhibin is declining.
Ovarian feedback is weakening.
The brain is working harder to stimulate the ovaries.
In early perimenopause:
Estrogen levels may still appear “normal.”
FSH may be intermittently high.
Symptoms may already be present.
Lab tests alone do not always reflect symptom severity.
Common Symptoms Related to Hormone Instability
Hot flashes
Night sweats
Sleep disruption
Anxiety or mood changes
Brain fog
Cycle irregularity
PMS changes
Breast tenderness
Palpitations
These symptoms often reflect hormone fluctuation, not just deficiency.
What Can Help?
Treatment is individualized. Options may include:
Hormonal support
Estradiol therapy to stabilize fluctuations
Progesterone to support sleep and nervous system regulation
Non-hormonal options
Lifestyle interventions
Alcohol reduction
Stress management
Sleep optimization
The goal is stability and symptom relief — not just “normalizing lab numbers.”
Key Takeaway
Hot flashes happen because:
Inhibin declines with ovarian aging.
FSH rises.
Estrogen becomes unstable.
The brain’s temperature control center becomes hypersensitive.
This is a natural neuroendocrine transition — but symptoms are treatable and EVOKE can help!
