How to stop coughing up green phlegm?

Treatment... If you have symptoms of infection, like fever, chills, decreased appetite, body aches, cold symptoms, etc., then you most likely have acute bronchitis which is treated w/ antibiotics. If you have no other symptoms, then it is likely chronic bronchitis, a form of copd. See your doctor for evaluation and treatment. If you smoke, you need to quit to decrease airway inflammation.