What are the symptoms of sinus tachycardia?

Sinus tachycardia refers to a heart rate above 100 beats per minute, with the electrical impulses originating  in the sinus node and travelling normally through the rest of the heart. Sinus tachycardia is an appropriate response when you are exercising, have a fever or are anxious. Most often you will not be aware of the high heart rate, but you might feel pounding in the chest. People with an underlying heart problem may develop chest pain, shortness of breath or lightheadedness during sinus tachycardia.