A light cough with sputum and no fever may be associated with chronic bronchitis, bronchiectasis, chronic obstructive pulmonary disease, smoking or environmental irritation. 1. Chronic bronchitis, due to the presence of chronic inflammation of the mucous membrane of the trachea and bronchial tubes, leads to coughing and coughing up phlegm, which is usually not accompanied by fever. 2. Bronchiectasis, due to irreversible dilatation of the bronchial tubes, resulting in cough and sputum, which is rarely accompanied by fever. 3. Chronic Obstructive Pulmonary Disease (COPD), due to heredity, environmental pollution, etc., leading to chronic obstructive pulmonary disease (COPD), resulting in cough and sputum. 4. Smoking, which is a common cause of chronic cough and sputum without fever. 5. Environmental stimuli, such as long-term in the oil smoke or coal mine and other environments, can appear cough, cough sputum, usually out of the environment can be improved. Specifically need to consult a doctor in time, under the guidance of the doctor for examination and treatment.