Three-year-old baby cough symptoms, or more reasons, the most common reason is the occurrence of respiratory infections, may be viral infection, bacterial infection or mycoplasma infection, will cause inflammation of the respiratory system, the inflammation part will secrete a large number of inflammatory exudate, will stimulate the child’s respiratory system, resulting in the phenomenon of cough. Anti-inflammatory treatment is more important at this time, if it is a bacterial infection, you can take oral antibiotics; viral infections can use ribavirin; if it is a mycoplasma infection, you can use azithromycin for treatment. Another reason, it is possible that the child occurs allergic phenomenon, resulting in allergic cough. When an allergic condition occurs, the allergic cells produce a large amount of inflammatory exudate, which can also stimulate the emergence of a cough, which needs to be treated with anti-allergic drugs, such as loratadine. In addition, there is the possibility of cough variant asthma, often caused by hyperreactivity of the airways, and in particular, spasm of the smooth muscles of the bronchus occurs, which triggers the appearance of cough.