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Hi, Dr. Stan here to help. This is most likely coming from your sinus cavities. It may be due to an allergen you are sensitive to or that you are a mouth breather and dry out the mucous lining in the back of your throat. You can have it evaluated by a visit to an ENT specialist who will diagnose and provide treatment. I am here to answer any additional questions you may have. Please leave a positive rating of 3-5 stars so I am credited for my response. Thank you.