Some variations of normal heartbeat
Sinus tachycardia
This means a normal heartbeat which is faster than usual (more than 100 beats a minute). This is usual when you exercise. It may also occur if you: are anaemic, have a fever (raised temperature), have an overactive thyroid gland, or are frightened (when you release adrenaline into the bloodstream which can speed up the heart).
Sinus bradycardia
This means a normal heartbeat which is slower than usual (less than 60 beats a minute). Many people who are fit have a heart rate between 50 and 60 beats a minute - sometimes slower. It may also occur if you have an underactive thyroid gland.
Ectopic beats
These are 'extra' heartbeats which occur 'out of sync' to the normal regular rate. They are very common and are usually harmless. Most people with normal hearts have at least one ectopic beat a day. You do not normally notice them. Sometimes you may notice them as a slight 'thud' in the chest if you are lying still in bed. Caffeine in tea or coffee, and alcohol may cause you to have more ectopic beats than usual. Some people with some types of heart disease have frequent ectopic beats.
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