Many patients complain of dry cough, dry cough is a more common manifestation of clinical cough, there are usually the following situations: 1, viral infection will invade the airway, irritation, allergic symptoms, manifested as a dry cough, with the gradual recovery of viral infection, airway mucosal inflammation repair, dry cough symptoms will gradually get better; 2, mycoplasma infections are usually manifested as a stimulating dry cough, daytime, nighttime is basically the same, the blood routine shows elevated leukocytes If there is a history of contact, such as contact with mycoplasma pneumonia patients or contact with animal hair, mycoplasma infection may be caused by dry cough; 3, part of the dry cough is non-infectious cough, such as asthma attack is usually manifested as coughing, coughing up sputum, wheezing, some patients manifested as a dry cough, the daytime symptoms are not obvious, the night after the middle of the night, especially after the cough is more intense, some patients complained of coughing in the middle of the night will be waking up in the morning to cough more intensely, this kind of patients are often suggestive of Allergic diseases, may be caused by acute asthma attack; 4, tumor can also lead to dry cough, manifested as paroxysmal, irritating dry cough, and dry cough frequency is progressive aggravation, need to consult a doctor in time to carry out imaging examination, exclude lung tumor lesions, so as not to delay the condition.