What is the term for an increased heart rate that often indicates stress or illness?

The term for an increased heart rate that often indicates stress or illness is sinus tachycardia. Sinus tachycardia is a specific type of tachycardia where the heart rate is elevated due to increased activity of the sinoatrial (SA) node, which is the natural pacemaker of the heart. Normal heart rates typically range from 60 to 100 beats per minute at rest, and when the rate exceeds 100 beats per minute, it is considered tachycardia.

This condition can occur in response to various factors such as physical activity, emotional stress, fever, pain, or medical conditions that increase the body's demand for oxygen or blood circulation. Recognizing sinus tachycardia is essential in clinical practice, as it can be a vital sign indicating an underlying issue that may need further investigation or intervention.