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Introduction: The COVID-19 pandemic brought with it the emergence of an infectious disease that specifically affects the respiratory system, ranging from mild to severe, especially in individuals with pre-existing comorbidities. The aim of this study was to characterize comorbidities in Mato Grosso hospitalized with COVID-19. Methodology: This is an observational, ecological study with a quantitative approach. Data collection was performed directly in the epidemiological surveillance information system, whose data were doubly tabulated and a descriptive analysis of the studied variables was performed. Results: In this study, a population composed of men (61.29%), elderly (59.14%), self-declared browns (52.69%), who were users of the Unified Health System (SUS) (65.59%) predominated. Among hospitalized patients, 76.34% reported having pre-existing comorbidities at admission, the most prevalent being Systemic Arterial Hypertension (SAH), Diabetes Melittus (DM) and kidney diseases. Discussion: It was found that the factor age and sex influence the incidence of new cases of the disease, and that having comorbidities is a risk factor for the development of complications and severe cases of the disease. The high prevalence of comorbidities influences the increase in hospitalizations for COVID-19, which tends to overburden the health system, as well as the clinical outcome of hospitalized patients. This study allows the knowledge of the health profile and the vulnerabilities experienced by this population, as well as favors the effective intervention in health promotion and prevention of diseases related to the incidence of COVID-19 concomitant with chronic health conditions. [ABSTRACT FROM AUTHOR]