Mobile Health (mHealth) is an exciting new field of Electronic Health (eHealth) with continual and massive developments at all levels of the stack, from the devices themselves at the lowest level to the operating systems and the software at the higher levels. We look at the origins of mHealth and its initial development as well as the reasons for that. The current state of mHealth varies significantly by geographic region and economic status. We look at the current role of mHealth worldwide and it's relation to the development of mobile technology. mHealth has also been used in many unique roles in disaster areas and in disease outbreaks, we have a look at a few of these unique usage cases such as mHealth use in diabetes, Dengue Fever and malaria. We also look at some remote application uses such as wireless ECG monitoring and the potential for change that has as well as the cost effective role it is playing in ensuring genuine drugs that are not tampered with reach the end users. We look at the role medical professionals and students are utilising mHealth for, and the many different areas where it is developing in education. We then move on to futuristic trends and developments and look at the factors hindering mHealth growth as well as up and coming technologies which are only now starting to hit the market and give a taste of what we can expect from mHealth in the future.