where does the phlegm i cough up from my chest come from
Phlegm is differentiated from other mucous in that it comes from the lungs rather than from the nasal passages; though, post nasal drip, a common symptom of colds, flus, sinusitis, and inhaling other irritants is often the cause of a phlegm like build up. If youâre coughing up colored phlegm, itâs usually a sign of bronchial infection, but simple diagnoses can be made from the color of the phlegm. If youâre coughing up yellow, green, or brown phlegm, your body is in the process of fighting an infection. If the color of your phlegm is brown or gray, it may be your body is expelling tars or resins built up from smoking or inhaling large amounts of dust.