Coughing while lying down and not coughing while sitting may be caused by the patient’s respiratory tract diseases, cardiac insufficiency, digestive tract diseases and other factors. 1. Respiratory diseases: If the respiratory tract is attacked by pathogenic bacteria, it may cause respiratory tract infection. When the patient lies down, the flow of phlegm will stimulate the respiratory tract, resulting in the phenomenon of coughing when lying down and not coughing when sitting up. 2. Cardiac insufficiency: If the patient has cardiac insufficiency, lying down will cause an increase in the amount of systemic return blood, which will lead to pulmonary stasis and symptoms of coughing. When the patient sits up, the amount of return blood is relatively reduced, and the symptoms may disappear. 3. Digestive tract diseases: If the patient suffers from gastroesophageal reflux disease (GERD), etc., when lying down, the stomach, esophagus and pharynx are relatively horizontal, and the gastric acid can reflux into the esophagus, which then refluxes into the pharynx, stimulating the mucous membrane of the respiratory tract, and causing coughing. Sitting up can effectively stop the reflux, it is manifested in the phenomenon of not coughing. Lying down on the cough, sitting can be relieved phenomenon can also be seen in other diseases, if the patient’s symptoms do not improve or aggravate, it is recommended to consult a doctor in a timely manner, improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment, so as to avoid delaying the condition.