Corruption has become a daily reality in Spanish political life, and it is a recurrent theme found in the media, institutes of social research, demoscopic agencies and citizenship. Right now, it is one of the most intense issues in public debate. As a result of this ubiquity, democratic principles and processes are undergoing a process of degradation that undermines the credibility and legitimacy of leaders, parties, cultural and political institutions. The objective of this research is to synthetically show causes, cases and consequences of the corruption phenomenon in Spain since the democratic transition to today, including recent government policies taken to control political corruption. In our analysis of these issues, we use as main sources several journals and newspapers, annual reports and studies of different institutions (International Transparency, CIS, Report from the States against Corruption, GRECO), and the EU Report against Corruption 2014, among others.