Lactose intolerance is a condition in which it is difficult to digest the lactose found in milk. Lactose is a sugar content which is naturally present in mammalian milk consisting glucose and galactose. Lactase deficiency is of three types namely, ‘Congenial’, ‘late onset or non-persistence’ and ‘secondary’. Lactose intolerance is also understood my various other terms such as alactasia, hypolactasia, lactose malabsorption, dairy product intolerance and milk sugar intolerance.