The common clinical causes of continuous coughing include respiratory system diseases, digestive system diseases, heart diseases and so on. Respiratory diseases: when the respiratory tract is infected with viruses, bacteria and other pathogenic microorganisms, it will cause the sick people to have a persistent cough, coughing up sputum and other symptoms, clinically common such diseases are pneumonia, tuberculosis, colds, acute bronchitis, acute pharyngolaryngitis. Lung tumors can also cause coughing, coughing up sputum, coughing up blood and other symptoms. 2. Digestive system diseases: These diseases are commonly found in gastroesophageal reflux disease (GERD), etc. Part of the population with the disease will also reach the pharynx and oral cavity and cause extraesophageal symptoms, such as coughing, dental erosion, bad breath, etc. 3. Heart disease: this kind of disease is common in heart failure, especially in left heart failure, the left ventricle can not effectively pump arterial blood to the whole body, resulting in blood stagnation in the pulmonary capillaries, the clinical manifestations of coughing pink foamy sputum, dyspnea and so on. Coughing can also be seen in a variety of other diseases, if there is a continuous cough and more serious, you need to actively seek medical advice, follow the doctor’s instructions for reasonable treatment.