Phlegm Blood in Phlegm: 20 Causes (& What To Do) Blood in phlegm is usually the result of prolonged coughing or dried airway, particularly when it is noted in young, healthy people.
Phlegm Green Phlegm: What It Means, 9 Possible Causes & Treatment Green phlegm is often a sign of a respiratory infection, such as sinusitis, bronchitis, pneumonia, or severe COVID-19.
Phlegm Yellow Phlegm: 8 Causes, Symptoms & How to Treat Yellow phlegm is typically a sign of a respiratory infection, like bronchitis, strep throat or pneumonia.
Phlegm White Phlegm: 6 Causes (& How to Treat) White phlegm is generally a sign of respiratory infections or inflammation (like bronchitis or sinusitis ) and lung diseases (like COPD).