Nasal irrigation, or nasal lavage or nasal douche, is a personal hygiene practice in which the nasal cavity is washed to flush out excess mucus and debris from the nose and sinuses. The practice is generally well-tolerated and reported to be beneficial with only minor side effects.[1] Nasal irrigation in a wider sense can also refer to the use of saline nasal spray or nebulizers to moisten the mucous membranes.