The patient has a cough with yellowish-green sputum, which is mainly considered to be caused by Staphylococcus aureus infection, and Pseudomonas aeruginosa infection is also easy to cause. At this time you need to go to the hospital to do routine blood tests, you also need to take a chest X-ray examination or do a CT examination of the lungs. Generally you can use cephalosporins, but also need to use metronidazole, tinidazole or levofloxacin antibacterial and anti-inflammatory treatment, if the effect is not very obvious, you also need to go to the hospital to do sputum and drug sensitivity test, according to the results of the examination to choose a more appropriate drug treatment. Simply by the color of sputum is generally not very accurate, but most are caused by purulent infections, often sputum will be more viscous, in the use of antibacterial drugs at the same time also need to use cough medication to thin the sputum wet, so that it is easy to discharge, can be conducive to the recovery of the disease.