A sneeze is the expulsion of air from the lungs through the nose to clear the nose of foreign particles.
During pregnancy, Bajoran women sneeze, frequently. Kira Nerys compared it to how Human women are nauseous during pregnancy. (DS9 episode: "Broken Link")
Julian Bashir tried to find a cure, but was able only to alleviate Kira's sneezing. (DS9 episodes: "Looking for par'Mach in All the Wrong Places", "The Darkness and the Light")
Mekkenda twists, when chewed, controlled when a Bajoran woman would sneeze. (DS9 short story: "A Walk in the Path of the Emissary")