The difference between dry cough and wet cough is mainly reflected in the clinical symptoms and causes, as follows: 1. Clinical symptoms: dry cough is only a cough, usually no sputum or very little sputum; wet cough is usually accompanied by sputum, often with thick yellow or white sputum. 2. Causes: (1) Dry cough is usually caused by dietary or environmental stimuli that cause discomfort in the throat. Mostly non-infectious cough, common in pharyngolaryngitis, acute bronchitis, pleurisy, bronchial foreign body and tumors and other diseases. (2) Wet cough is usually an inflammatory response to viral or bacterial infection of the trachea or lungs. Mostly infectious cough, common in chronic bronchitis, bronchiectasis, pneumonia, lung abscess and cavitary tuberculosis and other diseases. When the phenomenon of coughing, the first thing to do is to determine the nature of the cough, it is recommended to go to the hospital, do the relevant examination, to clarify the cause of the disease, symptomatic treatment.