Always dry cough belongs to the category of chronic cough. Generally, the following three conditions need to be considered for chronic cough: 1. Cough variant asthma. Cough variant asthma belongs to a special type of asthma and is mostly characterized by an irritating dry cough. The cough often occurs at night and in the early hours of the morning, when an increased cough occurs after smelling cold air, pollen or other irritating gases. Treatment at this time is mainly to reduce airway sensitivity and the use of bronchodilators.2. Reflux esophagitis, in which stomach acid from the stomach surges through the esophagus to the esophagus and throat, thus causing a burn in the throat, which in turn causes chronic pharyngitis. This type of chronic laryngitis is mostly a dry cough, and treatment requires suppression of acid reflux and treatment of chronic laryngitis, such as the use of omeprazole and slow-acting lemon. 3. Psychogenic cough, also known as psychogenic cough, is often related to the patient’s psychology, and treatment requires self-psychological adjustment by the patient, who can seek help from a professional psychologist if necessary.