The symptoms of coughing always appear with a cold, when the main reason or the following: 1, the cold is due to a decline in the body’s immunity by pathogens including common viruses, bacteria, mycoplasma, chlamydia and other invasion into the airways, so that the upper respiratory tract mucosa appears congested, edema, and even inflammatory secretions exuded. Although after treatment, the cold has improved inflammation control, but the inflammatory response of the upper respiratory tract mucosa has not completely dissipated, and has not fully returned to normal, so there will still be a cough persistent. 2, there are also some patients themselves have chronic respiratory diseases, such as chronic rhinitis, sinusitis, postnasal drip syndrome and chronic allergic asthma, may be due to the occurrence of the cold induce acute attacks of chronic diseases, the airways will experience varying degrees of inflammatory responses persisting leading to frequent coughing.