A Pilot Study of Trauma-Focused Cognitive-Behavioral Therapy for Treatment of Post-traumatic Stress in Adults.

Eligibility criteria: * Men and women over 18 years of age. * Referred to a community mental health care service (CMHCS) or hospital in the Maule Region for difficulties associated with the experience of traumatic events, symptomatology, or diagnosis of Post-Traumatic Stress Disorder (PTSD) or the complex form of Post-Traumatic Stress Disorder (CPTSD). * Not being treated for PTSD or C-PTSD at the time of recruitment Inclusion Criteria: * Men and women over 18 years of age. * Referred to a community mental health care service (CMHCS) or hospital in the Maule Region for difficulties associated with the experience of traumatic events, symptomatology, or diagnosis of Post-Traumatic Stress Disorder (PTSD) or Complex Post-Traumatic Stress Disorder (CPTSD). * Having the diagnosis of Post-Traumatic Stress Disorder (PTSD) or Complex Post-Traumatic Stress Disorder (CPTSD) by International Trauma Interview (ITI). * Fluent in oral and written Spanish language. * Access to telephone. Exclusion Criteria: * Previously or currently diagnosed psychotic disorder. * Current substance use disorder. * Current suicidal crisis. * Depression is the primary diagnosis. * Participation in a PTSD psychological treatment parallel to the study. Study's exit criteria: * Initiation of a psychological or pharmacological treatment for PTSD parallel to the study. * Change of medication dose in the case of participants with pharmacological treatment prior to the study.