There are many reasons for coughing with phlegm all the time, which are commonly found in bronchiectasis, tuberculosis, chronic bronchitis and so on. 1. Bronchiectasis: a chronic disease, due to chronic inflammation stimulation can lead to sensitivity changes in the airway mucosa, or infections lead to increased lung secretions, sputum increased, can cause long-term cough, phlegm phenomenon. 2. Tuberculosis: mainly caused by tuberculosis bacillus infection of the lungs, belonging to a chronic infectious disease, in addition to long-term cough with sputum, usually accompanied by blood in the sputum, afternoon low fever, fatigue, night sweats, loss of appetite and other clinical symptoms. 3. Chronic bronchitis: may be related to infection, smoking, allergies and other factors, belongs to the more common chronic diseases, in addition to long-term cough with sputum, usually also occurs sputum, wheezing, shortness of breath, chest tightness and other clinical symptoms. Old cough with phlegm may also have other reasons, it is recommended to consult a doctor in a timely manner to clarify the cause of the disease, under the guidance of the doctor for standardized treatment.