Sneezing is a reflex action that occurs when the body needs to clear irritants from the nasal passages. This can happen due to various triggers, such as dust, pollen, or strong odors. When the nasal lining is irritated, signals are sent to the brain, which then prompts a sudden expulsion of air through the nose and mouth. The process of sneezing involves several steps: the inhalation of air, closure of the throat, and a rapid release of air. This action helps to remove unwanted particles and can also spread germs, making it important to cover the mouth and nose while sneezing to prevent the spread of illness, such as the common cold or influenza.