###Human: What causes dry throat and mouth with blocked sinuses at night? ###Assistant: Hi. I think that you need to perform a CT scan for your nose and sinuses. There may be a surgical cause for your naso-sinal problems as polyps, deviated septum or hypertrophied turbinates. Perform the scan then show it to me. Do you have excessive sneezing or rhinorrhea? Do you have any allergies for any odors?