What can cause a productive cough mainly in the morning every day for about a month? been to doctors, congestion not in lungs. allergies or asthma?

Check bedroom: Hi emily. There may be something in the bedroom that is an allegan. That can include your bedding, a feaher pillow or feather or wool blanket. Since the cough has been going on for a month, i would check your heating system. You may need to replace the filter, or clean the humidefier if you are using a humidifer or vaporizer make sure you clean them. Hopefully, symptoms will improve.