Good afternoon, I know this thread was originally posted back in 2016, but I have just come across it now while searching for some clues as to what might be causing a similar issue. My uncle has been suffering for almost 2 years with excessive mucus coming up the esophagus into his mouth, without coughing, he has to constantly spit it out (into a tissue) as too much is produced to swallow it. The consultants seem to be at a loss to be able to diagnose what might be causing it. The investigations have been through and included Bronchoscopies, endoscopes, chest X-rays, CT scans, and MRI. Barium swallow procedure, however, no issues have been found, peak flows are excellent and heart and lungs too. A referral to an oral specialist too, but nothing abnormal detected there either. The medications have included treatment for post nasal drip, proton pump inhibitors, Sabutamol and Beclometasone inhalers, Phenergan and other Antihistimes, and Glycopyrronium. Some improvement has been seen, but the amount of mucus being produced is still excessive. I was wondering having read your post, if your consultants were able to resolve your problem?