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Why your heart suddenly beats fast, seemingly for no reason: How a racing pulse rate - even when your smartwatch says it is normal - could be the first sign of this life-changing condition... DR ELLIE CANNON

Daily Mail 1 min read 19 hours ago

My heart will suddenly beat fast for no particular reason. When this happens I struggle to catch my breath and feel anxious. I wear a smartwatch and it says my pulse rate is normal.
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