You thought it would never end: that tickle in the back of your throat that made you cough or have to clear your throat. It’s been going on for months. And now you know why: post-nasal drip. It’s a common diagnosis. It can happen for a number of reasons: allergies, viral infections (including the common cold), sinus infections, irritants in the air (such as fumes or dust). Less common causes include something stuck inside the nose (common in small children), pregnancy, and certain medications. Temporary – and normal – causes of post-nasal drip includes certain weather conditions (especially cold, dry air) and spicy foods.

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Whatever the cause, the problem is a steady trickle of mucous from the back of the sinuses that irritates the throat and nagging cough or other symptoms.  Read more at Harvard Health Publishing for treatments for post-nasal drip