Chest tightness and shortness of breath when lying down are considered to be the development of left heart failure. The redistribution of blood in the lying position and the increase in venous blood flow back to the heart in the lower extremities lead to increased pulmonary stasis. At the same time, the diaphragm is elevated in the lying position, which restricts the diastolic movement of the lungs, and the decrease in lung capacity also aggravates the dyspnea. In this case, the patient can rest in a sitting position, and the symptoms of chest tightness and wheezing can be relieved. It is necessary to go to the hospital to improve the ambulatory electrocardiogram, electrocardiogram, brain natriuretic peptide, cardiac ultrasound and left heart function measurement to clarify the cause of heart failure and the severity of heart failure, and take anti-heart failure treatment according to the test results.