If a patient wakes up with a rapid heartbeat in the morning, the following conditions should be considered: First, endocrine metabolic diseases are considered, especially for patients with previous hyperthyroidism, hyperparathyroidism, or hyperadrenocorticism, they will have palpitations, chest tightness, and shortness of breath in the morning. Second, in patients with a history of diabetes mellitus, if paroxysmal hypoglycemic reactions occur at night, tachycardia may also occur in the morning, but is usually accompanied by profuse sweating, pallor, and cold sweats. Third, for patients with previous history of cardiogenic diseases, in acute myocarditis, pericarditis, coronary artery disease unstable angina pectoris, malignant arrhythmia, severe heart failure, there will also be tachycardia in the morning. Fourthly, for patients with vegetative nerve dysfunction, this symptom and performance can also occur when sympathetic tone increases, especially after cardiac neurosis.