This is experienced by most healthy subjects at some time. It usually occurs in relation to sympathetic nervous system overactivity, e.g. after strenuous exercise, when given a fright or waiting for an interview or examination. It may he most noticeable in bed at night when external visual and auditory inputs are minimal and visccral sensations more prominent. Similar palpitations occur with excessive caffeine intake in coffee, tea or other drinks. Caffeine (found in tea, coffee, cola, etc.) enhances the action of the sympathetic nervous system hy augmenting the concentration of relevant secondary messengers in the myocardium.
Was this article helpful?
If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.