Our expert says:
Should beat around 72/min - fit people's heartbeat is usually slower - can be into the 50's, it goes up while you are exercising. A resting heartbeat over 100 is normally too fast. The causes can be infection, inflammation, heart diseases, problems with salt levels in the blood, abnormal thyroid and other glands - the cures will depend on the cause. You will have to let a doctor have a look if you are worried.
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