Why do you sneeze a lot if you bump your nose?

Sneezing after bumping your nose can occur due to irritation of the nasal passages. The impact may trigger the trigeminal nerve, which is responsible for facial sensations and reflex actions like sneezing. Additionally, the bump can cause a release of histamines, leading to inflammation and further irritation in the nasal area, prompting sneezing as a protective reflex to clear the airways.