"I think I may sneeze."
"A Klingon sneeze?"
"Only kind I know.
A sneeze is a convulsive expulsion of air through the nose. It is a reflex induced by nasal irritation.
In 2364, Data practiced sneezing shortly before the USS Enterprise-D arrived at his homeworld, Omicron Theta. (TNG: "Datalore")
B'Rat Ud induced sneezes by inhaling various spices. (ENT: "Rajiin")
During pregnancy, Bajoran women were prone to uncontrollable fits of sneezing. (DS9: "Body Parts", "Broken Link", "Looking for par'Mach in All the Wrong Places", "The Darkness and the Light")
Hupyrian beetle snuff caused sneezing. (DS9: "Rules of Acquisition", "Prophet Motive", "Profit and Lace")
Kira Nerys sneezed many times while she was pregnant with Kirayoshi O'Brien. Julian Bashir attempted to find a way to alleviate it. (DS9: "Broken Link", "Looking for par'Mach in All the Wrong Places")