Why does sinusitis cause cough?

Inflamed sinus lining can produce thicker mucus and narrow the drainage passages. Mucus may then run down the back of the throat, particularly when lying down, causing a tickle, throat clearing, or a cough that is worse at night. Cough is a common presentation of Sinusitis, but coughing also has many other causes, including viral infections, asthma, reflux, and irritants.

A blocked nose, reduced sense of smell, facial pressure, or discoloured nasal discharge can occur alongside sinus symptoms. The pattern of symptoms, how long they have lasted, and any breathing symptoms help a clinician work out the likely cause.

Drink fluids regularly and use saline nasal rinses or spray if these are suitable for you; this can help loosen mucus. Rest, avoid smoke and strong fragrances, and sleep with your head slightly raised if drainage is disturbing your sleep. A pharmacist can advise on pain relief or nasal treatments that fit your health needs and current medicines.

Do not use leftover antibiotics. Whether antibiotics are useful depends on the cause and course of the illness, so a clinician should make that decision.

Seek urgent medical assessment for trouble breathing, chest pain, coughing up blood, confusion, severe headache, swelling around an eye, changes in vision, or a very unwell appearance. Arrange a routine review if the cough persists, keeps returning, disrupts sleep substantially, or sinus symptoms are not improving. Children, pregnant people, and people with long-term lung conditions may need more individual advice.

Ask whether your symptoms fit sinus inflammation or whether asthma, reflux, allergy, or a chest problem should be considered. You can also ask which nasal treatment is appropriate, how to use a saline rinse safely, and which warning signs should prompt earlier review.