Big Data is not new but its utility in health care field is still at beginning stage. Health data range from medical histories, lab reports, treatment outcomes and patient’s experiences. This vast and voluminous data when scientifically analysed unearth hidden relations and conclusions that can aid in improving public health at economical costs. It can be used to describe, prescribe or predict occurrences. A clinician can provide the best health care service to a patient based on past observations and present information. It can also contribute to efficient administration. If challenges pertaining to privacy concerns and data accuracy are managed well, Big Data analysis can turn around the picture of health care industry for good.