Psychoanalysis and its application in the biological area. The area of Psychology already presents a lot of research in the context, looking for artificial and laboratory situations; however, the importance of contextual analysis of the individual as a whole, of their daily activities and, from this, the understanding of their perceptions. Through psychoanalysis it is possible to observe widely the subject as a whole, not focusing on the presence of organic or genetic disorders, Ansermet (2003) addresses this problem by stating that “We cannot see the subject only as someone who manifests an organic or mental defect, according to the logic of disability”. The systems that compose and organize the environment, according to Bronfenbrenner (1996), are constituted by the fitting of concentric structures called microsystem, what presents itself as the most active and direct contact environments, such as family, school or social work relationships; mesosystem referring to two or more environments of active social participation; exosystem, understood as environments that influence events that take place in the immediate environment of social relationship; and macrosystem, which comprise, in addition to the behavior of individuals, the connections between other people, the nature of bonds and the direct or indirect influence on the developing individual in the contexts in which they live and act actively. The use of psychoanalysis as a tool to decipher possible mental disorders has become essential, since it is intrinsically linked to the biological look for the diagnosis of a patient. Autism, attention deficit disorder, depression and hyperactivity (ADHD), among other diseases that can be diagnosed during childhood or late they are psychosocial disorders that have their diagnoses complemented by psychoanalysis. In this way, it is possible to perceive the challenges that psychoanalysis faces in terms of complementing the diagnosis of mental disorders in children, as well as the importance of psychosomatic studies in the elaboration of an accurate diagnosis that can be applied to children and their pathologists.