This paper highlights the epidemiological surveillance of venomous bites and stings according to four national information systems: SINAN (National Databank of Major Causes of Morbidity), SINITOX (National Information System on Poisoning), SIH-SUS (Hospital Information System of the Unified Health System), and SIM (Mortality Information System). The authors conclude that each information system has specific characteristics and addresses different demands. Although they contain large amounts of data, even if combined they fail to reflect the real magnitude of disorders caused by venomous bites and stings in the country.