Phlegm can build up at the back of your throat when you lie down in bed and trigger coughing at night. “The most common cause of this is an upper respiratory tract infection such as colds or flu ...
The cause of pulmonary fibrosis is unknown ... or pain when you take in a deep breath Coughing up blood or a pink/red phlegm. Dr Munisamy added: “If you are worried about a new persistent ...