The causes of fast heart rate in the morning are as follows: 1, increased sympathetic excitability, in this case we should pay attention to, for example, the original heart disease patients, suddenly in the morning manifested as increased heart rate, tachyarrhythmia, atrial fibrillation, supraventricular tachycardia or ventricular tachycardia ventricular fibrillation are occurring at this time, then you need to see a doctor; 2, physiological reasons, or due to puberty, menopause, manifested as plant nerve dysfunction, will also appear heart rate 3, stay up late, now more and more people stay up late, often will not rest in the middle of the night, the next morning will lead to increased heart rate, this patient needs to rest; 4, diabetic patients, suddenly appear in the morning hypoglycemic reaction, there will be increased heart rate; 5, hyperthyroidism or anemia patients will also show increased heart rate. Therefore, in the case of increased heart rate, it is necessary to identify the sleep or blood sugar status, or whether you have any primary disease. If you are not sure, the best choice is to see a doctor first.