What Your Nasal Mucus Color Means: Clear, Yellow, Green, Bloody, and More

Nasal discharge (mucus) changes color and consistency based on immune activity, hydration, and pathogens. It’s not a definitive diagnosis but a useful clue.

Color Guide

• Clear, thin: Normal; early viral URI, allergic rhinitis, non‑allergic rhinitis.
• White, cloudy: Dehydration, early infection, dairy consumption (thickens mucus).
• Yellow/Green: Neutrophil enzymes (myeloperoxidase) – indicates active immune response, not specific to bacteria. Seen in viral & bacterial sinusitis.
• Brown/Black: Dried blood, inhaled pollutants (smoke, dust), fungal sinusitis (rare).
• Pink/Red (blood‑tinged): Epistaxis, trauma, dry mucosa, nasal spray overuse; persistent = needs evaluation.

Consistency Clues

• Thick, sticky = dehydration, chronic sinusitis.
• Watery = allergic, vasomotor rhinitis, CSF leak (rare, unilateral, positional).

When to See a Clinician

• Symptoms >10 days without improvement.
• High fever, severe facial pain, periorbital swelling.
• Unilateral foul‑smelling discharge (possible foreign body/fungal).
• Recurrent epistaxis or blood‑tinged mucus without obvious cause.

Color alone doesn’t dictate antibiotics. Clinical context (duration, severity, exam findings) guides treatment.