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Green Phlegm: Causes, Treatment, and When to See a Doctor
Green, Yellow, and Brown Phlegm: What Does it Mean? - Healthline
Phlegm Color Chart: What the Color of Your Phlegm Means
Coughing Up Phlegm: Causes and Treatment - Cleveland Clinic
Mucus: Phlegm, Causes, Colors & How To Get Rid Of It
Bronchitis - Symptoms and causes - Mayo Clinic
Coughing Up Green or Yellow Phlegm - Buoy Health
Reasons for coughing up phlegm without feeling ill
Phlegm Cheat Sheet: Recognizing Normal and Concerning Colors …
Chest infection - NHS