Paroxysmal tachycardia can produce symptoms such as palpitations, chest tightness and chest pain, dizziness and weakness, fainting and anxiety. 1. Palpitations: also known as panic, mainly refers to the rapid heart rate, feeling that the heart is going to jump out of the throat, which makes the patient produce serious discomfort and unbearable. 2. Chest tightness and chest pain: due to the heart rate is too fast, diastolic period is too short, the return blood volume is insufficient, the ejection of blood from the heart is reduced, and the blood supply to the myocardium is reduced accordingly, which causes or aggravates the symptom of ischemia of myocardium, and produces chest tightness and chest pain. 3. Dizziness and fatigue: it is the decrease of blood ejection from the heart that leads to insufficient blood supply to the brain. 4. Fainting: the cerebral blood supply is sharply reduced, or when the tachycardia is suddenly terminated, the sinus node function is not restored in time to take over the control of the heart rate, resulting in cardiac arrest, fainting can occur, or even sudden death. 5. Anxiety: palpitation discomfort and other physical symptoms cause psychological anxiety or fear. If the above symptoms appear, it is recommended to consult the doctor in time, actively cooperate with the perfect examination, make a clear diagnosis, and follow the doctor’s instructions for treatment.