Some feel an uneasy sensation immediately before the heat starts.
A chilly, cold, or clammy feeling often follows the flash as the body rapidly cools down. The Hot Flashes
Lower estrogen tricks your hypothalamus—the body’s "heat manager"—into believing you are overheating, even when you aren't. Some feel an uneasy sensation immediately before the
Sudden warmth radiating through the upper body, skin turning blotchy, rapid heartbeat, and sweating. skin turning blotchy
When estrogen drops, a group of neurons in the brain (KNDy neurons) become more active, triggering a chain reaction that initiates a flash, often accompanied by palpitations or anxiety.