There are several causes of dry cough: first, the presence of respiratory tract infections, including bacterial and viral infections, often accompanied by fever, chills, coughing up sputum and other manifestations. Secondly, it is inflammation of the pharynx, and the self-perception of itching and discomfort in the throat. Third, consider laryngitis, speech will be accompanied by hoarse performance. Fourth, for allergic rhinitis, in addition to the symptoms of dry cough, there will be nasal congestion, runny nose, nasal itching. Fifth, for bronchial asthma, with a history of asthma attacks will have a dry cough, chest tightness symptoms. Sixth, drug factors, such as long-term use of captopril tablets, there will be irritating dry cough, dry cough can disappear after stopping the drug. Can be based on their own symptoms to consider, if necessary, blood tests and X-ray chest X-ray examination, in order to clarify the cause of the cause of the treatment, coughing frequently can be taken orally related to cough medication, such as pulmonary cough synergist, and so on.