Have your doctor prescribe Mucomyst 10% for use in a nebulizer. It will get rid of the mucus very quickly. It also cleared up my sinus condition and I no longer get headaches.
Hi, welcome to the forum, the possible causes of cough with thick mucous discharge are Gastroesophageal reflux, Laryngopharyngeal reflux, Respiratory tract infection, chronic bronchitis, Bronchiectasis etc.
It is important to point out the cause. You need to undergo lungs radiograph, endoscopy to rule out the causes.
You need to take mucolytics which includes iodide preparations, Acetylcysteine and steam inhalation after consultation from physician, as well as appropriate therapy for the root cause. Take care and regards.