Coughing up yellow lumps of sputum is mostly due to yellow sputum lumps caused by respiratory tract infections, which can be seen in acute bronchitis, bacterial pneumonia, bronchiectasis and other diseases. 1. Acute bronchitis: refers to acute bronchial mucosal inflammation caused by pathogenic microorganisms, allergies, physical and chemical stimuli and other factors. The main manifestations are coughing, coughing up sputum, which may be accompanied by different degrees of chest tightness and shortness of breath, fever and other symptoms. If the bacterial infection, mostly manifested as coughing up yellow sputum, can be manifested as coughing up sputum and coughing up yellow lumps. 2. Bacterial pneumonia: refers to pneumonia caused by bacterial infection. Common symptoms are coughing, coughing up sputum, fever, chest pain and other symptoms, the scope of the lesion may have dyspnea, respiratory distress and other symptoms. It can also cause coughing up sputum and coughing up yellow lumps. 3. Bronchial dilatation: refers to a variety of causes leading to the destruction of the bronchial wall structure, causing abnormal or persistent dilatation of the bronchial tubes. Clinical manifestations of chronic cough, coughing up a large amount of pus sputum, hemoptysis, etc., can also cause sputum coughing up yellow lumps. Coughing up sputum and coughing up yellow lumps has many other causes, which should be emphasized, and timely consultation, to identify the cause of the disease, and follow the doctor’s instructions for further treatment or therapy.