Postnasal drip occurs when mucus from the nose and sinuses drains down the back of the throat. It has many causes, including allergies, colds, and sinus infections. Gastroesophageal reflux disease (GERD) occurs when stomach contents back up into the esophagus (food pipe). A dry cough can develop if the stomach acid is inhaled into the lungs.
Sinus headaches are a symptom of sinus infections (sinusitis). A sinus headache may feel like a dull pain behind your eyes, in your cheekbones, forehead or bridge of your nose. Typically, sinus headaches go away once a sinus infection runs its course. But people should contact a healthcare provider if they have one that lasts more than a week. .