The first thing you need to know about the causes of this phenomenon is that there are two broad categories, including recurrent respiratory infections and cough variant asthma, and the specific treatment differs: 1. Recurrent respiratory infections: usually the medication is not long enough for respiratory infections, the symptoms disappear but the pathogens have not been completely eliminated, or you catch a cold or flu that causes pathogenic infections, so after stopping the medication The cough is repeated again. In this case, the cough suppressant treatment is mainly for the symptoms, and you can apply cough suppressants such as dextromethorphan or compound methocarbamol capsules, and if combined with bacterial infection, you need to apply antibiotics for treatment; 2. Cough variant asthma: cough variant asthma is a special type of asthma, which is mainly manifested by coughing, and the cough is paroxysmal or episodic, and it appears that the cough seems to be well and reappear. This phenomenon is mainly related to environmental factors, and the cough will reoccur when the irritants in the environment increase. Treatment is mainly based on inhaled glucocorticosteroids with the use of bronchodilators. Since cough is not a disease, but an organism reaction to clear the respiratory tract of foreign bodies, when a cough is cured and then recurs, it is important to first distinguish what the cause is and not to blindly use cough suppressants on your own. It is recommended that routine blood tests, C-reactive protein, allergen tests and pulmonary function tests be performed as prescribed by the doctor to clarify the cause of the cough and then treat it accordingly.