Can’t help but dry cough once you inhale is airway hyperreactivity, which may be related to chronic pharyngitis, chronic bronchitis, asthma, environment and other factors. 1. Chronic pharyngitis, especially chronic pharyngitis, a foreign body sensation in the throat, can occur when inhaling on the laryngeal stimulation, resulting in coughing symptoms. 2. Chronic bronchitis, inflammation of the mucous membrane of the trachea and bronchial tubes, which can increase the stimulation when inhaling, resulting in coughing symptoms. 3. Asthma, people with a history of asthma, airway inflammation and gas irritation increases, prone to irritating cough during inhalation. 4. Environment, if you are in the environment of smoke, irritating gases, due to the stimulation of the throat, airway can appear physiological cough, is a normal reaction. There may be other reasons for the above symptoms, such as cough variant asthma, eosinophilic bronchitis, if the long-term non-relief, need to be promptly consulted in a regular hospital, with the doctor to improve the examination, standardized treatment.