In view of the evolution of the pandemic by COVID-19 in Brazil, and the adoption of social restriction measures, an increase in cases of posttraumatic stress disorder (PTSD), anxiety disorder and depression is expected. In epidemic situations, mental health services can become overloaded; however, the evolution of these disorders over time is not known. This study aims to monitor the evolution of PTSD symptoms, anxiety and depression during the COVID-19 pandemic in Brazilians, and to investigate sociodemographic risk factors related to psychiatric history and contagion, as well as maladaptive personality traits and posttraumatic growth. It will be a longitudinal study, conducted through online questionnaires, with a sample of non-probabilistic convenience. The inclusion criteria are: being brazilian born or living in Brazilian territory; be over 18 years old; have access to digital devices; and be literate. A sample of at least 2000 people is expected. The instruments applied are a research questionnaire, the Posttraumatic Checklist 5 (PCL-5), the Depression, Anxiety and Stress Scale (DASS-21), the Personality Inventory for the DSM-5 – brief form (PID-5-BF), and the PostTraumatic Growth Inventory (PTGI). The study will be carried out in four stages: entry, one month, three months, and six months after the entry. The study relies on voluntary participation, with the agreement through the Free and Informed Consent Form. Data collection will be conducted in 2020, and the study will be completed in 2021. It will be financed with its own resources, and encouragement will be sought through research funding agencies.