Coughing up lumpy sputum can be caused by chronic bronchitis, pharyngitis, lung infections, lung abscesses, bronchiectasis, and so on. 1. Chronic bronchitis: coughing up sputum is a common symptom of chronic bronchitis, and the patient may cough up lumpy sputum due to purulent sputum in the acute stage of bacterial infection. 2. Pharyngitis: Pharyngitis may also cause the patient to cough up lumpy sputum, and also cause sore throat, hoarseness, fever and other symptoms. 3. Lung infections: Lung infections caused by Staphylococcus aureus can cause purulent sputum, resulting in lumpy sputum, and lung infections caused by other pathogens may also bring lumpy sputum. 4. Lung abscess: Lung abscess is a suppurative inflammatory disease of the lungs that causes the patient to cough up a large amount of purulent sputum. 5. Bronchiectasis: Coughing up pus and sputum is a common symptom of bronchiectasis, which is why bronchiectasis is one of the causes of coughing up lumpy sputum. If you cough up lumpy sputum, you should consult a doctor in time, cooperate with the doctor to improve the examination and active treatment.