Cough is always bad may be chronic bronchitis, pneumonia, tuberculosis and other diseases triggered by the symptoms, need to consult a doctor in time for examination. 1. Chronic bronchitis: Coughing is common in chronic bronchitis. Patients with this disease will have repeated episodes of coughing, patients will also cough up phlegm, chest tightness, shortness of breath, shortness of breath and other undesirable symptoms, the symptoms will be more serious after the cold, with the development of the disease, may lead to respiratory failure. 2. Pneumonia: Pneumonia can also cause coughing all the time, the patient will have fever, coughing up sputum, weakness and other symptoms, severe coughing may cause chest pain, and even coughing up blood, when the condition is serious, it may cause respiratory distress. 3. Tuberculosis: Tuberculosis can also occur in such cases, the patient cough to dry cough, the body will also appear low fever, night sweats, fatigue, fatigue, emaciation and other adverse symptoms, some patients will appear hemoptysis and other discomforts. Cough is always bad may also be caused by other reasons, such as cough variant asthma, gastroesophageal reflux stimulation cough, eosinophilic bronchitis, upper airway cough syndrome, lung tumors, pulmonary fibrosis, etc., need to consult a doctor in a timely manner, according to the doctor’s advice, combined with the history of the disease, symptoms and signs, to choose the appropriate examination, a clear diagnosis, and then standardize the treatment, to avoid the disease from further development.