👉 Tachyphylaxis, also known as a "tachycardia," is a condition where there is an abnormal increase in heart rate. It occurs when the heart muscle contracts too fast and does not recover properly. This can lead to a rapid heartbeat or irregular heartbeat, which can be uncomfortable or even dangerous. Tachyphylaxis is usually caused by a malfunctioning of the heart's electrical system, as well as other factors such as stress or illness. Symptoms may include