In light of the current scenario, it can be observed that overcrowding in the Brazilian prison system is a consequence of serious structural complications that have worsened since its foundation during the colonial period, leading to the problems faced today, such as the supremacy of criminal factions, which substantially increase crime rates, and other factors like inadequate infrastructure, causing a major crisis in the prison system. Given this, the purpose of this article is to address the issue of prison overcrowding in Brazil, demonstrating its causes and possible solutions to alleviate this deficiency in the correctional system. Therefore, information and data were gathered, considering the insights of scholars on the problem of overcrowding in Brazilian prisons, with a basis in the fundamental rights inherent to every human being, as established in the Federal Constitution of 1988, aiming to answer the following research question: what are the causes and consequences of overcrowding in the Brazilian prison system? In this context, this article is proposed to facilitate a comprehensive examination of the prison system and highlight the causes and consequences that overcrowding imposes on inmates. The methodological approach employed was a bibliographic and descriptive review. At the end of the research, it can be concluded that the lack of state assistance and the disproportionate number of available spaces for the quantity of inmates are among the causes of this serious issue faced by Brazilian society.