Coughing up phlegm that is greenish in color and thicker is mainly caused by inflammatory irritation of the respiratory system, and there are upper respiratory tract infections, pneumonia, lung abscesses, bronchiectasis and other diseases that are likely to cause this symptom. It is most common when there are viral, bacterial, and mycoplasma infections. Especially with bacterial infection is the most likely, is the need for effective antibacterial drugs to actively treat, generally can use cephalosporins or penicillin drugs, also need to use cough medication, which can make the thick phlegm dilution easy to discharge. If the effect of the drug is not very obvious, you can also according to the blood test and sputum bacterial culture test to choose the more sensitive antibiotics, so that the therapeutic effect will be better, in the usual need to pay attention to diet and rest, to avoid too much fatigue.