Journal of Information & Systems Management Souad SADKI, Hanan EL BAKKALI 5 3 2015 http://www.dline.info/jism/fulltext/v5n3/v5n3_2.pdf Recently, there has been a growing interest in the usage of mobile services and applications for healthcare. However, this growth also brings on many challenges such as privacy preservation. Many research works have been carried out emphasizing the important role privacy policies play in protecting patients’ private data from any kind of violation or misuse. In fact, policies are expressed using natural languages reflecting different actions third parties may perform on patient’s data. These policies may not necessary satisfy patients’ privacy preferences leading to conflicting situations. In this paper, we compare some privacy policies languages suggested in the literature taking into account a number of criteria such as high-expressiveness, abstraction and delegation of authority support. Also, we propose an approach aiming at resolving conflicts among privacy policies by negotiation. Finally, in order to show how our solution can be applied, we consider an example of conflicting privacy policies. For that, we adopt S4P, a language for specifying both patients’ preferences and third parties’ policies and which satisfy the different criteria considered in the comparative study.