Probable Bronchitis: Yellow or green sputum in the morning may indicate a bronchitis. When sputum is in a dark moist space for several hours, it becomes more viscid and changes color from a clear or white to yellow and a green. If one coughs up this type of sputum continuous during the day, it probably means that an active infection is going on and it would be wise to ask a physician to examine you
Answered 8/26/2020
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