Cough and runny nose symptoms can be seen in a variety of diseases, common respiratory diseases, such as upper respiratory tract infection, in addition to allergic rhinitis can also cause. 1. Respiratory diseases: such as upper respiratory tract infections, acute bronchitis and pneumonia, etc., can appear cough, runny nose symptoms, mainly bacteria or viruses and other pathogenic bacteria invade the human body to stimulate the mucous membrane of the nasal cavity and airways, may be accompanied by fever, sore throat, coughing up phlegm and other uncomfortable symptoms. 2. Allergic rhinitis: when exposed to allergic substances (such as willow, dust, pollen, etc.) will stimulate the mucous membrane of the nasal cavity to appear congestion, edema, and inflammatory exudation, etc., the increase of inflammatory secretion will stimulate the pharynx to appear congestion, runny nose, cough and other uncomfortable symptoms. There are many other causes of cough and runny nose, such as sinusitis, upper airway cough syndrome, postnasal drip can cause cough and runny nose, it is recommended to seek medical attention as soon as possible to clarify the cause of the disease and cooperate with the physician treatment.