The short answer
"Cringe attack" is an informal, non-clinical term for a sudden, involuntary memory of something embarrassing — paired with a physical reaction, usually a wince, a groan, or the urge to close your eyes. It's not a diagnosis and it isn't in any clinical manual. It's just the phrase people reach for to describe a very specific, very common experience: your brain, unprompted, replaying something cringeworthy while you're doing something completely unrelated.
The research
Clinical psychologist Ellen Hendriksen describes the cringe attack as striking during mindless activity — in the shower, folding laundry — when the brain, unprompted, surfaces a flashbulb memory of an embarrassing moment.
— Ellen Hendriksen, "3 Ways to Cope with Cringe Attacks," Psychology Today, 2024
Where the term comes from
The phrase has been popularized in mainstream psychology writing rather than coined in a research paper. Clinical psychologist Ellen Hendriksen described it plainly in a piece for Psychology Today: it happens when you least expect it — in the shower, folding laundry — and "our brains decide to sucker-punch us with a flashbulb memory of an embarrassing moment." The underlying phenomenon she's describing is what researchers call an involuntary autobiographical memory: a memory that surfaces spontaneously rather than being deliberately retrieved.
What makes it a "cringe" attack specifically
Not every involuntary memory is a cringe attack — the term is specifically about memories tied to embarrassment, awkwardness, or a social misstep, as opposed to sad, happy, or neutral memories that also surface involuntarily. The content is usually small in the scheme of things (an odd thing you said, a stumble, a joke that landed wrong) but the emotional charge attached to it is disproportionately large relative to how much it actually mattered to anyone else.
Is it the same as intrusive thoughts?
They overlap but aren't identical. "Intrusive thought" is a broader clinical term that includes unwanted thoughts of any content — violent, sexual, doubt-based — and can be a feature of OCD or anxiety disorders when frequent and distressing. A cringe attack is a narrower, informal subtype: specifically an intrusive memory, specifically embarrassment-flavored, and — for most people, most of the time — not clinically significant on its own.