Big data applications in healthcare have provided a variety of solutions to reduce costs, errors, and waste. This work aims to develop a real-time system based on big medical data processing in the cloud for the prediction of health issues. In the proposed scalable system, medical parameters are sent to Apache Spark to extract attributes from data and apply the proposed machine learning algorithm. In this way, healthcare risks can be predicted and sent as alerts and recommendations to users and healthcare providers. The proposed work also aims to provide an effective recommendation system by using streaming medical data, historical data on a user's profile, and a knowledge database to make the most appropriate real-time recommendations and alerts based on the sensor's measurements. This proposed scalable system works by tweeting the health status attributes of users. Their cloud profile receives the streaming healthcare data in real time by extracting the health attributes via a machine learning prediction algorithm to predict the users' health status. Subsequently, their status can be sent on demand to healthcare providers. Therefore, machine learning algorithms can be applied to stream health care data from wearables and provide users with insights into their health status. These algorithms can help healthcare providers and individuals focus on health risks and health status changes and consequently improve the quality of life.