Improving population’s access to health care services stands among the utmost priorities in the’agenda of alleviating poverty in Africa. Recently, many policymakers in sub Saharan African countries have tried to remove users fees at the point of service This policy aims at easing the financial burden of out of pocket paiements in an episode of illness,which can be catastrophic,hence boosting the demand for healthcare services. Delivering adequate healthcare services in urban suburbs has become increasingly difficult with the massive urbanization trend, particularlyin Sub Saharan Africa. In addition, difficulties in improving health conditions are intensified by the rise in the morbidity, due to chronic and communicable diseases. Combined together, these phenomenons have brought to the forefront the relevance of the issues relative to healthcare delivery, access and financing in urban areas.Building upon survey data, this thesis focuses on individual’s demand of healthcare services and their corresponding health expenditure in urban suburbs of Senegal. Chapter I lays the theoretical foundations of healthcare services demand and its specific features; and presents the Senegalese context. The methodology relative to data collection and data analysis, including the identified diseases, their course of treatment and the associated health expenditures are detailed in Chapter II. Using a multinomial probit model, Chapter III analyzes the demand of healthcare services resulting from individual’s statement of acute symptoms. Finally, Chapter IV assesses the determinants of health expenditure, using the Heckman model.