Why do some people temporarily lose memory after cold shower, pain, or fear?
Sudden stimuli such as a cold shower, intense pain, fear, or emotional shock activate the body’s fight-or-flight response. Stress hormones like adrenaline and cortisol are released rapidly, breathing may become irregular, and blood is preferentially redirected toward the heart and muscles. During this phase, the brain temporarily deprioritizes higher functions such as thinking and memory, which can cause mental blankness or confusion.
The hippocampus, responsible for short-term memory formation and recall, is extremely sensitive to stress hormones and brief changes in blood flow and oxygen. Acute stress transiently suppresses hippocampal activity, so memories are not properly formed or retrieved. This results in temporary memory loss, while long-term memories, identity, and consciousness remain intact. Importantly, there is no structural brain damage.
This condition is described as transient amnesia, meaning short-lasting and reversible memory loss. In rare cases, intense stress (including sudden cold exposure) can precipitate Transient Global Amnesia (TGA), in which a person remains alert but cannot form new memories for several hours, with complete recovery within 24 hours.
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1January 13, 2026 14.6K 47
