The problem of addiction to psychoactive substances, such as alcohol and other drugs, has been addressed in psychiatry traditionally from the perspective of a mechanistic-reductionist epistemological model, whose main focus in clinical care is to avoid or suppress the use of these substances, rather than understanding the meaning of a treatment and the meaning of the alterations of consciousness produced by these addictive substances. This paper attempts to contribute towards overcoming this epistemological perspective from the perspective of phenomenological psychopathology. In (...) the first part of the article, the main characteristics of phenomenology and its incorporation into the field of mental health will be presented. Then the issue of addiction will be analysed from two ways of understanding it: the mechanistic-reductionist model and the phenomenological dialectical model. Finally, the pragmatic consequences of the dialectical perspective of phenomenology, called Dialectical Phenomenology (DPh), which seeks to enrich the diagnostic process in the mental health clinic, allowing scientific diagnoses to approach the complexities of clinical reality, will be presented. (shrink)