What Kidney Patients Should Know During Summer

Summer in the Pacific Northwest doesn't always feel like a health risk, but for people living with kidney disease, rising temperatures deserve real attention. Heat and dehydration are a documented threat to kidney function, and the consequences can range from kidney stones and urinary tract infections to acute kidney injury - a sudden drop in kidney function that can cause permanent damage if not addressed quickly. For patients whose kidneys are already compromised, that risk is elevated.

When the body loses fluids through sweat without adequate replacement, blood volume drops. As a result, the kidneys receive less blood flow, a condition called renal hypoperfusion, which limits their ability to filter waste and maintain the body's fluid balance. As the National Kidney Foundation (NKF) notes, body temperatures above 104 degrees Fahrenheit can cause significant kidney problems, and dehydration can lead to low blood pressure and decreased kidney function even before extreme temperatures are reached.

For patients on kidney dialysis, the picture is more complicated. Fluid intake is often carefully restricted for dialysis patients, which means the standard advice to "drink more water" in hot weather doesn't apply the same way. The goal is balance, not just volume. Patients receiving life-sustaining kidney dialysis, whether in a dialysis facility or at home, should talk with their kidney care team now that summer has arrived about what fluid adjustments, if any, are appropriate for hot weather conditions.

For people with chronic kidney disease (CKD) who are not yet on kidney dialysis, staying well-hydrated is one of the most accessible and meaningful things they can do to protect kidney function during summer. The Centers for Disease Control and Prevention (CDC) recommends drinking water consistently throughout the day rather than waiting until thirst sets in, since thirst is a late signal of dehydration, especially in older adults. Avoiding alcohol and excessive caffeine, limiting outdoor activity during peak heat hours, and keeping medications stored at appropriate temperatures are also important considerations.

A few additional things worth knowing for patients with CKD specifically this summer: Kidney stones are more common in hot weather. Concentrated urine from inadequate hydration creates conditions where minerals clump together and form stones. Staying hydrated is the single most effective prevention. However, for dialysis patients, maintaining a strict fluid balance is crucial because failing kidneys cannot remove excess water. It is important to consult with your kidney care team.

Some common medications affect how the body handles heat. Diuretics, blood pressure medications, and immunosuppressants used by transplant patients can all affect hydration and the body's ability to regulate temperature. This is worth raising with your kidney care team now that summer has arrived.

Heat-related kidney injury can happen without extreme temperatures. Cases of acute kidney injury in outdoor workers have been documented in the Pacific Northwest at temperatures well below what most people consider dangerously hot. For patients with compromised kidney function, the threshold is lower.

Summer is the time of year to have those conversations with your kidney care team before you need them. A little preparation goes a long way now that summer is here.