Patients are short of breath at night, commonly due to the following reasons: i. Cardiac insufficiency: Patients are prone to chest tightness and shortness of breath at night, especially at night when they fall asleep in the prone position, and may experience an increase in chest tightness and shortness of breath. Bronchial asthma: It is easy to aggravate the symptoms at night or in the morning, resulting in chest tightness, shortness of breath, cough and other related phenomena. Third, other causes: especially if the patient also has severe abdominal distension or large amounts of ascites, the diaphragm will have a certain impact on the patient’s respiratory function when sleeping in the prone position at night, which will lead to chest tightness and shortness of breath. In addition, diseases such as chronic obstructive pulmonary disease, bronchiectasis, interstitial fibrosis, severe anemia, and lung cancer may also cause shortness of breath at night.