What are the causes of sinus tachycardia?
Strenuous exercise, a fever, fear, stress, anxiety, certain medications, and street drugs can lead to sinus tachycardia. It can also be triggered by anemia, an overactive thyroid, or damage from a heart attack or heart failure.
We aren’t sure about the exact cause of IST, but it likely involves a combination of factors, including: a problem with your sinus node unusual nerve signaling that causes your heart rate to increase dysfunction of the nerves that work to lower your heart rate