Firstly, there are two varieties of Onion which are white and red. Onions are very good source of mental stimulant. White onions are more useful if we view them from medical views. White onion are very good stimulant as I said earlier. They increase strength and induce sleep. All these things stated are the properties of Onion. Now let us talk about the Curative uses of Onions. Onion can be used with advantage in the treatment of cough, cold, influenza, constipation, scurvy and hydrophobia. They are also remedy for tuberculosis, cardiac troubles, dyspepsia, leprosy, piles, swelling and blood impurities.