Due to papillary thyroid cancer, I had a complete thyroidectomy in sept 2009. In 2011, I had surgery to remove cancer from 3 lymph nodes in the neck. Currently, I m experiencing extreme post nasal drip. I have no allgeries, hardly eat diary and have a humifier in my bedroom at night. My question is this, can post nasal drip be a symptom of the thyroid cancer returning ?