A lying down throat tickle cough dry cough causes usually mainly include gastroesophageal reflux, postnasal drip syndrome and cough variant asthma. 1. Gastroesophageal reflux refers to the retrograde movement of gastric acid through the esophagus to the pharyngeal cavity, where acidic substances irritate the pharyngeal cavity, leading to symptoms such as itchy throat and coughing, which are obvious when the patient is lying on his or her back, and can be accompanied by acid reflux, heartburn and other symptoms. 2. Postnasal drip syndrome refers to rhinitis or sinusitis and other diseases of the nose will produce a certain amount of secretion, lying down when the inflammatory medium will flow to the pharyngeal cavity, throat and other parts of the stimulation to show cough symptoms. 3. When the cough variant asthma patients lying down may also occur after the symptoms of dry cough, can also be manifested as itchy throat, shortness of breath and other symptoms. The phenomenon of lying down with a tickle in the throat and coughing a dry cough there are other possibilities, once found need to seek medical treatment in a timely manner.