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Hi there!Sneezing is a protective reflex that serves to clear irritation or foreign material out of the nasal cavity. Sudden onset of sneezing usually indicates inhalation of material into the nasal passages; this could be anything, debris, dust bunnies, grass, etc. In most cases of such acute sneezing, it spontaneously resolves in a relatively short period of time. If the sneezing is more chronic/ongoing, different problems are usually at play, although inhalation of foreign material and inability to clear it can also cause chronic sneezing.Hope this helps! Please let me know if you have any additional questions.