Researchers have issued a warning that scorpions are increasingly infiltrating cities in Brazil, linking this phenomenon to rapid urbanization and climate change, which are contributing to a rise in sting incidents.
According to figures from Brazil’s Notable Illness Information Systems, over 1.1 million sting cases were reported from 2014 to 2023, reflecting a staggering 250% increase during that period. This data is detailed in a study published in Public Health Frontier magazine.
The surge in scorpion stings correlates with unplanned urban development—characterized by densely packed housing and inadequate waste management. Urban sprawl not only encroaches on natural habitats but also inadvertently creates new environments conducive to scorpion survival.
“They’re really the first to adapt,” noted Manuela Bert Pucca, an assistant professor at Sao Paulo State University. “Cities often provide all the essentials: plenty of hiding spots—like walls and drains—consistent warmth, and a steady food source from cockroaches and other urban insects.”
Scorpions have developed a particular affinity for sewers. These spaces are warm year-round, largely free from predators, and offer abundant food, which often includes cockroaches. Some scorpion species can endure up to 400 days without food and even reproduce without mating, complicating efforts to control their populations.
Warm summers, coupled with heavy rains and droughts, further support their growth in urban settings as they adapt well to humid conditions.
Provisional data for 2024 indicates scorpions are linked to around 200,000 stings and 133 fatalities in Brazil. Researchers predict an alarming 2 million additional cases from 2025 to 2033. They emphasize that the actual scale of the problem is likely much larger, as many victims opt for home remedies or simply avoid medical care altogether.
“In the areas where I work, scorpion stings are a daily nightmare, particularly in impoverished and crowded communities,” Pucca mentioned. “The stats suggest that this issue will only grow in the future.”
Although only 0.1% of reported stings result in death, children and the elderly are the most at risk. Generally healthy individuals tend to recover, but they can experience several days of distressing symptoms like pain, swelling, and nausea.
Previous studies modeling scorpion distribution in Brazil have suggested that their habitats might stretch into urban landscapes, driven by warm, humid weather.
Countries such as Brazil, Paraguay, Bolivia, Mexico, Guyana, and Venezuela have seen notable increases in scorpion populations and related health crises over recent decades. The emergence of such public health concerns is something to be taken seriously. In Europe, over 35 native species exist, yet comprehensive studies on scorpion population trends are lacking.
Researchers emphasize the importance of preventive measures, stating that scorpions flourish in untidy and moist environments. Recommendations include keeping surroundings clean, sealing wall cracks, using drain covers, and checking items like shoes and towels before use.
Dr. Manuela Gonzalez Suarez, an ecologist at the University of Reading who wasn’t involved in the study, mentioned that increased awareness might lead to more sting reports.
She added that there’s no need for excessive fear regarding the findings.
The Brazilian health system provides free treatment for scorpion stings, with anti-venom available at certain hospitals. “If someone gets stung, don’t wait it out. Head straight to a medical facility,” warned Professor Elian Candiani Arantes from the University of Sao Paulo, one of the paper’s authors.
“Anyone can be affected, especially since even a small sting can be fatal for a child,” she cautioned.
Professor Nivedita Ray Bennett from the University of Leicester highlighted the study’s call for urgent action.
Pucca also mentioned a common misconception that scorpions are inherently dangerous. “They’re not out to get us. These creatures are primarily defensive and play crucial roles in ecosystems, such as controlling pest populations and supporting biodiversity.”
