The massive explosion of data is taking place after the invention of social media like FaceBook, Twitter, LinkedIn, Emails, Blogs etc. As per report, 24 petabytes data are processed by Google per day. On average, the Like and Share Buttons are viewed across almost 10 million websites daily. Photo uploads are total 300 million per day in FaceBook. How can we process those huge volume of data? Because traditional software don't have the capability to store those huge volume of data. Typically we are referring this as Big Data. Parallel and distributed computing is making it possible to process and analyse for which Apache's Hadoop is famous and changing the pattern of business. Organizations are now bound to perform the customer sentiment analysis in order to take the critical business decisions. However, Big Data analysis is slowly entrapping into all the business domains including medical and health care sector.