There are many reasons for coughing, which may be related to acute trachea-bronchitis, bronchial asthma, cardiovascular system diseases and so on. 1. Acute trachea-bronchitis: inflammation of the mucous membrane of the trachea-bronchus, initially dry cough or a small amount of mucous sputum, followed by an increase in the amount of sputum, coughing intensified, occasionally accompanied by blood in the sputum. When accompanied by bronchospasm, shortness of breath with varying degrees of chest tightness may occur. 2. Bronchial asthma: a heterogeneous disease characterized by chronic airway inflammation and airway hyperresponsiveness. Clinical manifestations are recurrent symptoms of wheezing, shortness of breath, chest tightness or cough, often at night and in the early hours of the morning attack or aggravation, cough is mainly irritating cough. 3. cardiovascular system diseases: such as mitral valve stenosis and left heart failure and other diseases, these diseases will cause pulmonary edema, pulmonary stasis, thus causing symptoms of coughing. Coughing can also be caused by other diseases, such as acute pharyngitis, allergic cough, gastroesophageal reflux irritant cough. If the symptoms are not relieved or aggravated, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to improve the examination and treatment, so as not to delay the condition.