If I have a very severe cough that takes like 10 minutes to clear phlegm that im pretty sure is from my lungs does that mean I could have bronchitis?

See below. There are a number of possible reasons for a cough depending on the context: Post nasal drip from sinuses, acute bronchitis, pneumonia, chronic bronchitis and other causes. For an overview of the various causes for coughing See > http:///bit.ly/1PQ3UFM.