In this diploma thesis Suicide yesterday and today I focus on the topis of suicide in the point of view of social studies. The thesis is divided into two parts. In the first part, I analyze three theoretical works dealing with suicide and suicide, namely the works of Emil Durkheim, Tomas Garrigue Masaryk and the collective works of Luděk Brož, Daniel Münster and other theorists. In the first part, I conclude that in the theoretical field there is no consensus on the interpretation of the causes of suicide. In the second part of my work I compare this three theoretical works and I also present the conclusions of the theoretical probe, which I developed in this work. This part is divided into thematic chapters according to possible causes of suicide, which I came to mainly based on the theoretical part. In the second part, I try to connect and compare scientific-theoretical views on suicide and unscientific views. The aim of the theoretical probe was not to find answers to questions related to the issue of suicide, its aim was to bring new perspectives to the discussion concerning suicide. Key words Suicide, suicidologie, Masaryk, Brož, Durkheim, suicide reasons