Sinus Tachycardia is a normal physiological response to situations such as exercise, or an increased sympathetic tone with increased catecholamine release—stress, fright, flight, anger. Other causes include:anxiety, fever, dehydration, etc. IOW, it's normal. Now.... there are other types of tachycardia which are NOT normal; ventricular tachycardia, supraventricular tachycardia, inappropriate sinus tachycardia, postural orthostatic tachycardia. Do you have the nomenclature correct?
Sinus tachycardia is basically a heart rate above 100 that is not an arrhythmia, in other words, a normal rhythm, but rapid.
As Tom said, there are lots of causes for sinus tachycardia. Some are normal, some are caused by an underlying disease that actually rarely has something to do with the heart.
Normal causes of sinus tachycardia:
- Exercise / physical activity (incl. activities like climbing stairs, sex, etc)
- After heavy meals, especially high-carb meals.
- Standing up too quickly
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