Mobile health ("m-health" in brief) includes activities in the field of medicine and public health, which are carried out by using mobile devices, such as mobile phones, patient monitoring devices, personal digital assistants and other wireless devices. M-health is a new, increasingly fast growing area, which may play a role in the process of transformation in healthcare, while also improving its quality and efficiency. The aim of the study is to present various opportunities offered by the use of modern mobile technologies in healthcare with a particular focus onchorothe most important categories of m-health applications, taking into account both their benefits and potential risks associated with their use. With the ability to store data in the "cloud", using sensors and mobile applications, m-health facilitates collecting a large number of medical data, information on physiology, lifestyle and daily activities, as well as data on environmental factors. Mobile applications market is developing very quickly. Currently, the largest number of mobile applications relate to pro-health physical activity (31%), programs of medical information (17%) and the so-called. 'wellness' (relaxation techniques) (15%). Further down, there are nutritional applications (7%) to assist users in complying with diet programs, health management programs (7%), e.g., monitoring health parameters, emotional states, overseeing medication, as well as diagnostic applications, alarms and others. Innovative m-health systems are not free of imperfections and threats. Concerns about the safety of such solutions involve the issue of independent decision-making by users on the basis of information provided by m-health applications, which may be incorrect or outdated. M-health tools should not replace doctors. However, they may help to maintain good health and assist patients in coping with their illnesses. [ABSTRACT FROM AUTHOR]