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Mysterious Kidney Disease Strikes Young Texas Workers
ReMysterious Kidney Disease Strikes Young Texas Workers
A form of chronic kidney disease that has devastated agricultural workers in Central America and South Asia is now appearing in Texas, affecting young, otherwise healthy laborers who work outdoors in extreme heat.
A mysterious form of kidney disease that has devastated young and middle-aged agricultural workers in Central America and South Asia has surfaced in Texas, baffling researchers and raising concerns about the health of outdoor laborers. Known as chronic kidney disease of unknown etiology, or CKDu, the condition causes kidney failure in otherwise healthy adults who lack the traditional risk factors for kidney disease, such as diabetes and hypertension.
Physicians at Houston safety-net hospitals, including Ben Taub, have treated men in their 20s and 30s who arrived with kidney failure, some with urine the color of Coca-Cola, according to a report in Texas Monthly. These patients, largely undocumented laborers from Mexico and Central America, work in construction, roofing and other outdoor trades in extreme heat, often with limited water breaks. They show none of the typical causes of kidney disease.
«What’s striking about the Texas cases is how closely they mirror what we saw originally in Central America,» said Dr. Gokul Paidi, a family medicine physician at Community Healthcare Network in New York who has published a review on the condition. The disease was first described among sugarcane workers in El Salvador and Nicaragua in the late 1990s and is known as Mesoamerican nephropathy. Similar clusters have been reported in Sri Lanka, India, rural Thailand and the Tierra Blanca area of Mexico.
«What’s emerging is that these are likely related conditions, essentially clusters of the same underlying disease process showing up in different farming and industrial regions around the world,» Paidi said. Unlike typical chronic kidney disease, CKDu develops without diabetes, hypertension or glomerulonephritis, a disease that inflames the kidneys’ filtering units. It typically strikes young to middle-aged adults, more often men, who work in agriculture and manual labor in hot, low-resource regions.
Experts refer to CKDu as a «silent disease» because most patients do not initially complain of symptoms. Many learn they have the condition during routine screening blood tests, according to Dr. Richard J. Johnson, an emeritus professor of medicine at the University of Colorado and a leading expert on kidney diseases. Later, it can cause fatigue, sleep disturbances, nausea, weakness and shortness of breath from anemia. By the time symptoms appear, many patients are approaching end-stage kidney disease.
Heat stress is considered a leading suspected driver, though the exact cause remains unknown. Experts believe a combination of occupational and environmental factors may gradually damage the kidneys. Strenuous outdoor labor can lead to repeated heat stress and dehydration, potentially compounded by exposure to crop pesticides and smoke from burning sugarcane. Workers may also contend with unsafe drinking water and rely on over-the-counter NSAIDs for pain, factors that could further strain the kidneys.
According to a review of Harris County hospital records cited by Texas Monthly, roughly one in six emergency dialysis cases in uninsured or undocumented patients had no identifiable cause, a pattern consistent with CKDu. Some patients are reluctant to seek care or participate in research because of their immigration status, making it harder to track the disease and detect kidney damage before it becomes irreversible.
There is no specific test for CKDu. Doctors diagnose it by ruling out other causes of chronic kidney disease, along with a patient’s occupational and environmental exposures. «Kidney biopsy is the closest thing to a gold standard, but isn’t practical for widespread screening,» Paidi said. There is also no disease-specific treatment. Management focuses on controlling blood pressure, avoiding additional kidney injury, and using dialysis or kidney transplantation in advanced disease. Some patients receive ACE inhibitors, but these drugs can sometimes worsen kidney function.
Many affected people live in resource-poor regions where dialysis and transplants are often unaffordable or inaccessible, increasing the odds of premature death. Experts suggest that improving hydration and shade, reducing work hours, and starting earlier in the day could reduce kidney damage. The emergence of CKDu in Texas highlights a growing concern for laborers in the United States who face similar working conditions.
