Sputum is yellowish-green and thick in most cases due to respiratory infections, such as acute bronchitis, pneumonia and other causes, the specific causes of the disease should also go to the hospital in time for examination to confirm. 1. Acute bronchitis: most cases are caused by viral infections, but we can not rule out the combination of bacterial causes such as nasal congestion, runny nose, sore throat, etc., in severe cases, there may also be yellowish-green pus sputum, chest tightness, dyspnea and other symptoms. If patients with acute bronchitis symptoms, can be manifested as sputum is yellow-green very thick phenomenon. 2. pneumonia: due to Pseudomonas aeruginosa infection or other pathogens causing fever, cough, dyspnea, coughing up sputum and other symptoms. If the symptoms are more serious, it can lead to sputum is yellowish green and thick phenomenon. Sputum is yellowish green may also be seen in many other reasons, should go to the hospital in time for examination and diagnosis, to clarify the cause of the disease, under the guidance of a professional physician, combined with their own situation for targeted treatment, to avoid aggravation of the condition, which will have an impact on the health of the body.