Does chronic sinusitis cause coughing up phlegm?

Inflamed sinus and nasal passages can produce thicker mucus or prevent it from draining normally. Mucus may then run down the back of the throat, especially when lying down, causing throat clearing or a cough. The material may feel like phlegm even when the original problem is above the chest. Coughing up phlegm can also arise from conditions affecting the lungs, reflux, smoking, or infection, so its colour and duration do not diagnose the cause alone.

Note when the cough occurs, whether you have nasal blockage or facial pressure, and whether breathlessness or chest discomfort is present. Drinking fluids and using a suitable saline nasal rinse may make mucus easier to clear. A clinician can examine your nose, throat and chest and choose treatment for the underlying cause. Do not rely on leftover antibiotics or cough medicines without checking that they fit your symptoms.

Seek urgent care for severe breathing difficulty, blue or grey lips, chest pain, confusion, or coughing blood. Arrange a medical review when phlegm persists, the cough keeps disturbing sleep, or you have fever, wheezing, or worsening facial symptoms. A long-lasting cough deserves assessment even if sinus symptoms are also present.

Ask whether the cough is more consistent with post-nasal drainage or a chest problem, and whether your nose and sinuses need treatment. You can also ask how to use saline care safely and which warning signs should prompt a return visit.