Post nasal drip could be due to a sinus infection,
a cold or
a chronic allergy. These can lead to
a post nasal drip and lead to an irritation in the throat. It could be sinusitis, if it is accompanied by nasal stuffiness and facial pain or pressure. Post nasal drip could also be due to allergens. So, please discuss with your doctor and clear your doubts before you consent for surgery. Regards.