A recurring cough can be a symptom of chronic bronchitis, but it can also be a symptom of pneumonia, allergies, pharyngitis and other diseases, which need to be examined in a timely manner. 1. Chronic bronchitis: Chronic bronchitis can cause coughing to recur, and patients with this type of disease may also experience coughing up phlegm, shortness of breath, breathlessness and other symptoms. Persistent coughing may cause capillary rupture, which may be manifested as blood in the sputum. As the disease progresses, the amount of sputum may increase. 2. Pneumonia: Coughing repeatedly may also be the discomfort caused by pneumonia, the patient will cough, chest tightness, shortness of breath, chest pain and other adverse symptoms, along with varying degrees of fever, chills, fatigue and other discomforts. 3. pharyngitis: pharyngitis may also occur with coughing back and forth, accompanied by coughing up phlegm. Suffering from this kind of disease pharynx will appear dry, itchy, pain and other adverse symptoms, swallowing action will have pain and foreign body sensation, some patients will appear early in the morning, dry vomiting, persistent coughing may cause sputum with blood. 4. Allergy: Coughing over and over again may also be due to allergies caused by the discomfort, contact with allergens or long-term in a dusty environment will appear in such cases, may also cause sneezing, runny nose and other adverse symptoms, allergies are more serious will lead to breathing difficulties. In addition, other diseases can also cause the cough to recur, if the symptoms do not ease or aggravate, it is recommended to consult a doctor in a timely manner, improve the examination, clarify the cause of the disease, and cooperate with the treatment under the guidance of the doctor.