A feeling of a thumping heart when lying down is often seen in people with a thin body type, and can also occur in patients with cardiac arrhythmias. For arrhythmias, it is common in patients with rapid arrhythmias, such as sinus tachycardia, paroxysmal supraventricular tachycardia, and atrial fibrillation. In addition, for patients with cardiac insufficiency, the situation of feeling the heart thumping when lying down can also occur, mostly due to cardiac insufficiency, which is aggravated by the increase in venous blood return in the lying position, leading to the occurrence of tachycardia. For a feeling of a thumping heart when lying down, it can also be common in patients with cardiac neurosis, who often have no organic disease but often feel severe symptoms. Through systematic examination, based on the exclusion of organic diseases, psychotherapy can be given as the main treatment, supplemented by drug therapy.