Medically reviewed by William Truswell, MD Postnasal drip occurs when mucus from your nasal passages drips down the back of your throat. The symptoms of postnasal drip include coughing and frequent ...

Unless you're a smoker, chronic cough has three major causes: postnasal drip, asthma (the most likely of lung diseases that can cause coughing) and gastroesophageal reflux disease, better known as ...

post-nasal drip, headache, and pressure around your eyes, forehead, and cheeks. Chronic sinusitis can be caused by abnormal growths in the sinuses called nasal polyps, allergies, infections ...