Why does my resting heart rate vary so much from day to day?

Modified on Tue, 07 Dec 2021 at 03:17 PM

Various factors can affect your daily heart rate, such as fatigue, stress, activity levels, nutrition, drinking alcohol or acute illness. Your resting heart rate is a reflection of your heart rate under resting but wakeful conditions for a day, which could differ significantly from day to day. 

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