Any healthcare application must deal with a lot of data,in many different formats, data sizes, and other aspects of data handling. For early disease detection, improvised patient care, and other purposes, accurate medical data analysis must be carried out. As a result, effective methods for analyzing multi- model medical data must be developed. Such data analysis is ideal for processing as ML Models. This paper talks about the features and characteristics of big data, how to present big-data and the various ML algorithms that are used in big data analytics. This paper also talks about , how big data analytics can be used for maintaining electronic health records, diagnosing diseases, predicting patients emergency conditions, and so on. The paper will bring to light, how healthcare can be enhance by he use of big data.