Dry cough is a dry cough, which is defined as a cough with no or very little sputum, less than 10 ml of sputum per day. There are many causes of dry cough. In addition to major respiratory diseases, cardiovascular diseases, neurological factors, medications, and psychological factors can cause dry cough. Dry cough is most commonly seen in non-infectious coughs, such as cough variant asthma, eosinophilic bronchitis, and variant coughs, which mostly manifest as a dry cough or a small amount of mucus sputum. Infectious coughs are more often wet coughs, such as pneumonia and bronchiectasis, but a small number of people can also have a dry cough. Acute and subacute dry coughs are treated symptomatically, and identifying the cause is the key to successful treatment of chronic cough. In the absence of etiologic testing, empirical treatment can be based on clinical clues and common etiologies.