If you are coughing up green or brown phlegm you most likely have bronchitis. It will not go away on its own, so you will need to go to the Doctor and get an antibiotic.
Bronchitis is an inflamation of the bronchus and broncreoles. It makes the victim cough very hard all throughout the day. It can last anywhere from a few weeks to several months.
Bronchitis is an inflammation of the air passages between the nose and the lungs, including the windpipe or trachea and the larger air tubes of the lung that bring air in from the trachea (bronchi)....
Medical diagnosis, referring both to the process of attempting to determine the identity of a possible disease or disorder and to the opinion reached by this process