Hello Thank You for contacting HCM. Welcome to Health Care Magic. My name is Dr Muhammad Ahmad & i will look into your problem. I have gone through your query and would try to help you in the best possible way. There is a tube like connection between our ear and resporatory trach which also include teeth...now this canal maintains the pressure in rear so that when you slap someone on ear the drum doesn t burst and pressure is delivered through this tube to respiratory tract but some times during flue or during procedures something closed or blocks this canal temporarily so when ever a bubBle nearby the canal or air passes thru it a popping sound is created sometimes we feel our ear is suddenly blocked sometimes we feel it got suddenly relieved of a blockage thats because of this canal in your case this canal has been blocked or something is blocking it fluid etc WHAT TO DO : VALSALVA MANEUVER What is valsalva: close nose and mouth and increase abdominal poressure as YOU defecate till you ear a pop sound and this canal opens.. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health