A perplexing kidney disease, characterized by the failure of the organs to filter blood correctly without apparent underlying risk factors, is emerging among young workers in Texas. This condition, known as chronic kidney disease of unknown etiology (CKDu), has historically been rare in the United States but is now being observed by physicians at multiple Texas hospitals.
Doctors in Houston have reported a cluster of cases, predominantly affecting men in their 20s and 30s who are otherwise healthy. These individuals were often laborers, with some collapsing while on the job, whether performing tasks like painting or road paving. Physicians describe CKDu as a "silent killer" because it often presents no warning signs until its later stages, by which point the kidneys may be irreversibly damaged.
CKDu was first recognized in the 1990s in Central and South America, where it is termed Mesoamerican Nephropathy. It has also been documented in India and South Asia. The cause of CKDu remains a mystery, though it is not contagious. The leading hypothesis among researchers suggests that prolonged exposure to extreme heat, combined with dehydration during intense physical labor in hot environments, may lead to recurrent acute kidney injury. This cumulative damage can eventually result in CKDu.
Physicians who spoke with Texas Monthly indicated they have been observing these cases for approximately a decade, primarily at safety-net hospitals that serve patients regardless of insurance status. Many of the affected individuals were undocumented migrants who had come to the U.S. from Central or South America. The cases were reported at Ben Taub hospital and other safety-net facilities within Harris County, which includes Houston.
While the exact number of cases, hospitalizations, or fatalities attributed to CKDu in the U.S. is not clear, isolated instances have been reported in California, Texas, and Florida since at least 2018. One of the earliest documented U.S. cases involved a 41-year-old agricultural field laborer and truck driver who had immigrated from El Salvador and was diagnosed in Washington D.C. in 2018.
CKDu typically affects young or middle-aged adults, often men, residing in rural areas and engaged in strenuous work. The kidneys are vital organs responsible for filtering waste from the blood. When they cease to function properly, toxic substances accumulate, which can be fatal. Initial symptoms of kidney damage can include nausea, vomiting, loss of appetite, fatigue, weakness, and sleep disturbances; many CKDu patients report experiencing extreme fatigue.
Globally, chronic kidney disease is a growing concern. In 2016, an estimated 275.9 million people worldwide suffered from the condition, a significant increase from 147.6 million in 1990. In India, CKDu constitutes the second leading cause of chronic kidney disease. While diabetes remains the primary cause of chronic kidney disease globally, accounting for nearly a third of cases in India, CKDu is a notable secondary cause.
Treatment for CKDu can involve blood pressure medications and dialysis to remove waste products from the blood. In severe cases, a kidney transplant may be necessary. To prevent kidney damage, particularly in hot conditions, medical advice includes drinking ample water. Dietitians recommend consuming approximately 3.7 liters of water daily for men and 2.7 liters for women, especially when working outdoors. The color and smell of urine can also indicate hydration levels, with dark yellow or strong-smelling urine suggesting a need for more fluids.