There is a big variety of medical and health applications existing by 2017. Categorizing mobile health applications is a complicated process due to a considerable number of products in this field. There were no articles containing systematic review of mobile health and medical applications before 2012. (Mosa, Yoo and Sheets, 2012.) Mosa, A. S.

M., Yoo, I. And Sheets, L. (2012) were first authors to classify in their study smartphone-based healthcare technologies according to the functions and specialization. In this chapter the Author describes the most popular categories selected from the article of Mosa, Yoo and Sheets (2012) and other scientific works.Disease Diagnosis ApplicationsDisease diagnosis applications for mobile devices are valuable tools for making the diagnosis at the bedside. Software from this category can be very cost effective. Some clinical tests are very costly and medical workers tend to avoid them.

Identification of the most relevant tests according to the symptoms will exclude unnecessary tests. (Sarasohn-Kahn, 2010.)Medical Calculator ApplicationsMedical calculators are programs for computing different clinical indices and formulas. The most used indices in medicine are body mass index, individual drug dosing, body surface area, etc. Most of the cases of clinical calculations require the use of complex equations with big load of entry parameters. Mobile applications for clinical calculator have an interface to allow the users simplified parameters input and score calculation.

Medical calculator users do not have to know the exact formula for computing the index. (Eknoyan, 2007)Drug Reference ApplicationsDrug reference mobile applications are highly useful in the field of healthcare. A drug reference applications usually include the names of medicaments, doses, indications, cost of the drug, pharmacology and other characteristics. (Adibi, 2015.)Clinical Communication ApplicationsSmartphones provide users with a variety of communication options: voice and video interaction, text messages, E-mails and multimedia exchange.

Communication with the help of mobile devices in the field of medicine and health care provides the quick exchange of important and urgent information among medical professionals that leads to the medical errors decrease. (Soto et al., 2006.)Medical Training ApplicationsMobile devices can be used as the tools for medical training. Applications of this category provide training in the latest evidence-based medical practices. (Broderick and Abdolrasulnia, 2009)Health and fitness ApplicationsHealth and fitness section of mobile applications has a wide range of subcategories and is one of the most popular mHealth category among regular users.

Health and fitness applications provide users with a proper diet and general healthcare information; help to improve fitness activities and lose or gain weight; consult during pregnancy, etc. In most of the cases fitness applications require to input personal data of the user, such as physical parameters, gender, date of birth, etc. Fitness software use combination of the smartphone’s sensors, detectors, output and input devices to gather, process and analyze the data of the customer in the process of his activity. In addition, there are applications on the market that have possibility to be synchronized wirelessly with wearable devices and sensors. (Zheng et al.

, 2014.)Hearing aid ApplicationThe market of health mobile software likewise offers applications that allow users to transform their smartphones into a personal hearing aid. Applications of this type catch the sound using the microphone of the smartphone to adapt the income signal for the hearing abilities of the user. Some of the hearing aid applications only increase the volume of the incoming signal, at the same time other more complex applications offer similar functionality that can be found in a regular hearing aid. Advanced applications of this segment can lower the background noise and focus on the sound signals that are far away.

(Medwetsky, 2015.)