What Phlegm Color Reveals About Your Respiratory Health

Phlegm color shifts give you immediate clues about what's happening in your airways, helping you judge whether irritation, inflammation or infection is building before symptoms intensify Yellow and green tones reflect immune activity, while pink, red, brown or black phlegm signal bleeding, long-standing lung issues or fungal infection, giving you clear markers for when to act quickly Sudden changes from your normal phlegm pattern matter more than the color itself, allowing you to use your personal baseline as a reliable guide for when something is wrong Texture changes — such as thick, sticky or chunky phlegm — often point to uncontrolled airway inflammation, giving you another early sign that your respiratory system is under strain Nebulized hydrogen peroxide, when properly diluted, helps lower viral load in your nasal passages, sinuses and lungs, easing phlegm triggered by viral irritation and helping you recover faster