Onions are one of the most commonly found kitchen spice items in every home. They are often used for cooking purposes owing to the fine aroma and taste it adds to food. In some parts they are also used for medicinal purposes. They can be added to almost every dish to spice it up. Onions are cultivated and used around the world. As a food item, they are usually served cooked, as a vegetable or part of a prepared savoury dish, but can also be eaten raw or used to make pickles or chutneys. They are pungent when chopped and contain certain chemical substances which irritate the eyes. However Onions do more than spicing up food or making our eyes teary, In this article we will be delving into some very important and unknown facts about onions as well as its possible side effects.