Dr. Joseph Mercola - Take Control of Your Health What Phlegm Color Reveals About Your Respiratory Health
Dec 27, 2025
The color of your phlegm can reveal key insights about your respiratory health. Yellow and green hues indicate immune activity, while shades of pink, red, or black may signal serious issues. Sudden changes from your normal phlegm pattern are crucial warning signs. Texture matters too; thick or foul-smelling mucus suggests inflammation. Learn how nebulized hydrogen peroxide can help reduce viral load and why preventive practices, like hydration, are essential. Knowing when to seek medical help is vital for your well-being.
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Personal Baseline Matters Most
- Sudden shifts from your usual phlegm pattern matter more than any single color cue.
- Use your personal baseline to detect early airway strain before symptoms escalate.
Color Reflects Immune Activity
- Yellow and green reflect immune cells and enzyme activity, not automatically bacterial infection.
- Green signals a stronger immune battle and needs monitoring if paired with fever or worsening symptoms.
Dark Or Bloody Phlegm Is Concerning
- Pink, red, brown, and black point to blood, older oxidized blood, long-standing lung issues, or fungal infection.
- These darker or bloody colors demand timely evaluation, especially with repeated appearance.