You put a salt and warm water mixture in something that looks like a little teapot. Then pour it through one nostril and let it drain out the other. You have to practice a little, but once you get the hang of it, it can ease allergy or cold symptoms and may even help you get rid of a cold quicker. Just make sure you use distilled or cooled boiled water and keep your neti pot clean.
It’s been used for thousands of years in Asian medicine to treat stomachaches, diarrhea, and nausea, and studies show that it works for nausea and vomiting. There’s some evidence that it might help with menstrual cramps, too. But it’s not necessarily good for everyone. Some people get tummy trouble, heartburn, diarrhea, and gas because of it, and it may affect how some medications work. So talk to your doctor, and use it with care.