With our growing population and rising health concerns, wearable gadgets are like superheroes in disguise. Technology adoption in healthcare sector is to predict or diagnose various diseases. This review aims to investigate various aspects of wearable device technology used in healthcare. Wearables can be stylish wristbands or comfy neckpieces that track our heart rate, sleep patterns, and even warn us of potential problems. Currently, the healthcare sector is facing certain challenges such as high count of ageing population, chronic diseases, erratic diet issues, cardiac problems, etc. As the data generated through digital devices can be analyzed to predict and warn the concerned person and improve the health, it can be a breakthrough towards this lacuna in healthcare. Based on the research work done it can be elucidated that wearables are the future of healthcare sector which can aid in diagnosis as well as prognostics. This work reviews the role of various wearable devices in early diagnosis and treatment and shows a systematic review of the wearable devices and how they can act as a boon in healthcare industry. The purpose of this work is to spread awareness about the wearable technology among the people and to contribute towards the outset of smart city.