The purpose of this thesis is to examine the usability of internet services for health treatments. The purpose of this study is to investigate how to improve the usability on Internet-based platforms to enhance the user experience around these systems. This, by examining the e-service 1177 as an example of such services, by using theories and previous research. Theories and methods that are dealt with are based on the literature regarding usability on web-based websites. Previous research suggests that usability is essential on similar platforms that offers online treatments. The data collection was done using a qualitative data collection method called think aloud. This data collection is used as user cases. By analyzing the content of the web applications' different pages and functions, development suggestions in the form of guidelines are generated on how to improve the current stage of similar e-services. This thesis is intended to create a foundation with guidelines for other organizations profiling themselves for onlinetreatments. The conclusion is that several components should be improved for enhancing the usability on such platforms.