Big Data is mostly thought of evolving the businesses or creating smart cities, however, Big Data can also be used in Healthcare sectors. According to McKinsey & Company identified four main sources of Big Data in Healthcare industry. The four sources are: Activity (claims) and cost data, Clinical data, Pharmaceutical R&D data and Patient behavior and sentiment data.
I recently came across very informative article which talks about how these four sources of Big Data can be used in Healthcare. Following is the link to the article, I hope you will find it useful.
http://www.datasciencecentral.com/profiles/blogs/4-ways-big-data-is-transforming-healthcare