How does declining estrogen affect the hypothalamus and body-temperature regulation?

During menopause, the decline in estrogen levels significantly impacts the hypothalamus, which serves as the body’s primary temperature control center.12

As estrogen concentrations drop, the hypothalamus becomes overly sensitive, leading to a disruption in its ability to effectively regulate body temperature. This physiological shift triggers sudden autonomic nerve activation, which causes the blood vessels supplying the skin to dilate.234

This process results in hot flashes, characterized by a rapid cooling response that includes:
* A sensation of intense warmth, particularly in the face and upper body.34
* Flushing of the skin.34
* Increased perspiration.34
* Occasional tachycardia (accelerated heart rate).34

These episodes, which can last for several minutes, may be followed by a sensation of cold or shivering as the body attempts to recalibrate its temperature.34