The question is where the mucous is coming from. The most common cause would be a chronic sinusitis leading to post-nasal drip. An ENT evaluation and possible treatment with steroid nasal sprays can be considered. Also a laryngoscopy to visualize any obstruction or anatomical abnormalities can be considered.
GI causes would include GERD - which can present with similar symptoms. If the upper GI series was not revealing, an upper endoscopy or a 24-hr pH study (the definitive test for GERD) can be considered.
Referrals to an ENT and/or an GI doc would be the prudent next step.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b