I understand how worrying it can be to see blood in your phlegm. Yellow phlegm often points to a sinus or respiratory infection. Nasal sprays like Dounase (azelastine/fluticasone) can sometimes irritate the nasal passages, causing minor bleeding that drips down your throat and mixes with mucus. While Montair FX (montelukast/fexofenadine) is generally safe for long-term sinus care, coughing up blood is a symptom that always warrants a professional medical evaluation. I highly recommend contacting your doctor soon so they can examine your throat and sinuses, rule out any infections, and safely guide your next steps.
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Is it normal to cough up yellow phlegm mixed with blood after taking Montair FX for two years for sinus issues and starting Dounase two days ago?