A bout of panic at four or five in the morning may be caused by paroxysmal atrial fibrillation, paroxysmal supraventricular tachycardia, cardiac neurosis, etc. If you have symptoms, you should go to the hospital in time. 1. Paroxysmal atrial fibrillation: paroxysmal atrial fibrillation is usually caused by emotional excitement, heavy drinking, etc. It occurs at night or at rest when the vagal nerve tone increases. At the onset of the disease, patients will experience shortness of breath, palpitations (rapid heartbeat, often accompanied by panic), fatigue, chest tightness, dizziness and other symptoms, and some patients will also experience symptoms such as dyspnea, pallor and chest pain. 2. Paroxysmal supraventricular tachycardia: paroxysmal supraventricular tachycardia may be caused by heart surgery, poor lifestyle, etc. Patients will experience symptoms such as panic, chest tightness, dizziness, fainting, etc., and some of the patients will also have anxiety and fear due to palpitations. 3. Cardiac neurosis: cardiac neurosis may be caused by heredity, environment, emotional vulnerability and other reasons, the most common symptom of the onset of the patient is panic, the patient will also have angina, dyspnea, insomnia, dreamy and other symptoms. If you feel abnormal, you should go to the hospital in a timely manner, after diagnosis under the guidance of the doctor to choose the most appropriate treatment, daily life can be appropriate to carry out some physical exercise, enhance immunity, avoid excessive exertion lifting heavy objects.