Cough is a common symptom of the respiratory tract, and cough in adults needs to be treated according to its cause. The causes of cough are upper respiratory tract infection or lower respiratory tract infection: 1. If the cough is caused by upper respiratory tract infection or viral infection, the patient is advised to drink more water and rest; 2. For cough without phlegm, it is recommended to take some cough suppressants, like licorice tablets or codeine oryzanol tablets; 3. If the cough is caused by lower respiratory tract infection, it must be treated for the cause; 4. If the cough is caused by bacterial infection or atypical pathogen infection If the cough is caused by bacterial infection or atypical pathogens, it needs to be treated against bacteria and atypical pathogens; 5. If the cough is caused by allergic factors, the allergic factors need to be avoided and symptomatic treatment should be given at the same time; 6. Generally, cough is good for lung clearance and protection of lung function, and if the cough obviously affects the patient’s life, it can be treated with cough suppressant therapy, such as codeine orangiferine tablets or codeine phosphate, but it is generally not recommended. Therefore, whether or not cough suppression treatment is needed, it is necessary to seek medical consultation with a specialist and follow his or her advice before taking medication.