Aster is not recommended for long-term infusion. Aster is the dried root and rhizome of the plant Asteraceae, which belongs to the class of Chinese herbs that resolve phlegm, stop cough and calm asthma. It has the effect of moistening the lungs and lowering the qi (moisturizing the lungs to bring down the upwardly charged lung qi), resolving phlegm and relieving cough, so it is mainly targeted at coughing and coughing up phlegm. It can be used for coughs caused by external evils and internal injuries to the lungs. However, the aster infusion can not replace the drug to play a role in treating the disease. In addition, the adverse effects of the drug are not clear, and long-term use of the drug in water is not recommended unless necessary. If necessary, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the evidence, according to their own situation, reasonable choice, not to take on their own, so as not to delay the condition.