Tachycardia is a medical condition characterized by a heart rate that is faster than normal, usually more than 100 beats per minute at rest. There are different types of tachycardia, including sinus tachycardia, supraventricular tachycardia, and ventricular tachycardia. Tachycardia can be caused by various factors, including exercise, stress, anxiety, fever, certain medications, illegal drugs, anemia, overactive thyroid gland, heart attack, heart failure, and other heart problems. In some cases, tachycardia may not cause any symptoms or complications, but if left untreated, it can lead to serious health problems, including heart failure, stroke, or sudden cardiac death. Treatment for tachycardia may include specific maneuvers, medication, cardioversion, or surgery to control a rapid heartbeat. It is important to consult a healthcare provider if you experience symptoms of tachycardia, such as palpitations, shortness of breath, dizziness, or fainting, to determine the underlying cause and appropriate treatment.