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A mother in the U.K. who began snoring for the first time in her life was stunned to learn the unexpected symptom was a sign of a rare and potentially life-threatening cancer.

"I started snoring, which I’d never done before," she recalled. "I was waking myself up, breathing through my mouth rather than my nose."

Claire Barbery, 51, initially brushed off the blockage on one side of her nose, blaming it on the after-effects of COVID-19 or irritation from frequent testing while working at a care facility, as reported by SWNS.

DOCTORS REVEAL KEY SIGNS OF LYME DISEASE AS TICK SEASON INTENSIFIES ACROSS US

It wasn’t until the persistent congestion worsened and she started snoring in her sleep that she sought medical advice .

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