# Health risks and healthcare impacts of extreme temperatures > Live situation record from CLSTR: https://clstr.news/situations/heat-exposure-health-risks > Updated: 2026-09-08T11:06:18.000Z. Sources: 78. Developments: 16. Medical experts have issued extensive warnings regarding the health risks of extreme heat, focusing on cardiovascular, renal, and neurological complications. High temperatures and humidity can lead to the depletion of essential minerals like sodium, potassium, and magnesium, which are critical for heart rhythm and muscle movement. For those with hypertension or heart disease, dehydration decreases blood volume, forcing the heart to work harder and potentially causing palpitations, arrhythmia, or heart attacks. Recent research continues to expand the scope of these risks. In Chicago, an analysis of hospital diagnoses between 2011 and 2023 found that rising temperatures are linked to kidney diseases, skin conditions, venous system disorders, and mental health issues such as heightened aggression, anxiety, and difficulty concentrating. Cardiology experts note that the risk to those with hypertension is particularly acute during heatwaves where humidity exceeds 70%. In such conditions, the body’s attempt to cool itself by increasing blood flow to the skin can cause tachycardia and double the amount of blood circulating per minute. Vulnerable groups include the elderly, overweight individuals, and those with pre-existing heart, lung, or kidney diseases. As high temperatures persist, doctors are warning of “accumulated heatstroke” and “modern summer fatigue.” Unlike rapid-onset heatstroke, accumulated heatstroke results from several days of fatigue, sleep deprivation, and dehydration. This fatigue is often exacerbated by temperature fluctuations between indoor air conditioning and the outdoors, which can disrupt autonomic nervous systems. To manage these trends, some organizations have begun implementing nutritional support, such as providing omega-3 fatty acids, to help manage inflammation related to physical fatigue. ## Claims - Extreme heat is linked to over 30 different health issues beyond heatstroke. (single source) - Heat exposure is linked to acute kidney failure and the exacerbation of multiple sclerosis. (single source) - Extreme temperatures are associated with increased insect-related injuries and psychiatric or behavioral disorders. (single source) - There is a correlation between extreme heat and higher rates of physical injury, including assault and gun violence. (single source) - High temperatures can change the chemical composition of pesticides, potentially making them more toxic. (single source) - Approximately 2.4 million agricultural workers in the United States face increased risks due to pesticide use during heatwaves. (single source) - Heat increases pesticide risk by making skin more permeable and causing chemicals to evaporate more quickly. (single source) - Standard protective equipment, such as PVC gloves, becomes less effective at high temperatures. (single source) - Heatstroke can occur when high temperatures are combined with high humidity and poor ventilation. (single source) - High temperatures cause blood vessel dilation, which can lead to lower blood pressure and dizziness. (single source) - Sweating during heat leads to the loss of magnesium, potassium, calcium, and sodium. (single source) - Heatstroke can cause body temperatures to rise rapidly to 40-41 °C. (single source) ## Timeline ### 2026-09-08: Health experts warn of accumulated heatstroke and summer fatigue Medical experts warn of accumulated heatstroke and modern summer fatigue caused by heat, sleep loss, and temperature fluctuations, recommending hydration and omega-3 rich diets for recovery. 2 sources. https://clstr.news/cluster/health-experts-warn-of-accumulated-heatstroke-and-summer-fatigue ### 2026-09-07: Hypertension risks increase during high heat and humidity High temperatures and humidity levels above 70% pose significant risks to individuals with hypertension and heart disease, potentially causing tachycardia and dehydration. 4 sources. https://clstr.news/cluster/hypertension-risks-increase-during-high-heat-and-humidity ### 2026-09-05: Chicago research links extreme heat to unexpected health issues A Chicago-based study reveals that extreme heat waves are linked to unexpected health issues, including kidney disease, skin conditions, and mental health disturbances like anxiety and aggression. 3 sources. https://clstr.news/cluster/chicago-research-links-extreme-heat-to-unexpected-health-issues ### 2026-09-03: Extreme heat linked to surge in emergency room visits Studies in the US and Mexico reveal that extreme heat significantly increases emergency room visits for diverse conditions, including kidney failure and mental health issues, straining healthcare systems. 4 sources. https://clstr.news/cluster/extreme-heat-linked-to-surge-in-emergency-room-visits ### 2026-08-31: Extreme temperatures linked to increased heart failure and diverse health risks Studies reveal that extreme temperatures significantly increase health risks, including heart failure hospitalizations and over 30 other conditions ranging from kidney failure to mental health issues. 5 sources. https://clstr.news/cluster/extreme-heat-linked-to-diverse-health-risks-and-neurodegenerative-complications ### 2026-08-29: Cardiologists warn of increased heart risks during heatwaves Medical experts warn that extreme heat increases cardiovascular stress, highlighting the need to monitor sudden chest pain and maintain electrolyte balance through proper hydration and diet. 11 sources. https://clstr.news/cluster/health-risks-of-extreme-heat-blood-pressure-muscle-tension-and-heatstroke ### 2026-08-28: Summer health risks: Heatstroke, blood pressure, and dizziness Medical experts warn of increased summer health risks, including heatstroke, seasonal blood pressure changes, and dizziness caused by dehydration and heat exposure. 4 sources. https://clstr.news/cluster/blood-pressure-fluctuations-and-heatstroke-risks-in-summer ### 2026-08-26: Extreme heat increases health risks and pesticide toxicity Extreme heat is linked to over 30 health conditions, including kidney failure and psychiatric issues. In the US, 2.4 million farmworkers face increased pesticide toxicity and absorption risks due to rising heat 2 sources. https://clstr.news/cluster/extreme-heat-increases-health-risks-and-pesticide-toxicity ### 2026-08-23: Medications that may impair heatwave coping abilities Common medications for depression, ADHD, blood pressure, and heart conditions can impair the body's ability to regulate temperature and manage heat during heatwaves. 3 sources. https://clstr.news/cluster/medications-that-may-impair-heatwave-coping-abilities ### 2026-08-22: Heatwaves increase risks of stroke and circulation issues High summer temperatures increase the risk of ischemic strokes due to dehydration and can worsen venous circulation issues, leading to leg swelling and fatigue. 3 sources. https://clstr.news/cluster/heatwaves-increase-risks-of-stroke-and-circulation-issues ### 2026-08-21: Health experts warn of kidney stone and blood clot risks during summer Medical professionals warn of increased health risks during summer, including kidney stones from dehydration and deep vein thrombosis caused by prolonged immobility during long-distance travel. 9 sources. https://clstr.news/cluster/health-experts-warn-of-kidney-stone-and-blood-clot-risks-during-summer ### 2026-08-21: Extreme heatwaves trigger diverse health risks and physiological changes Extreme heatwaves are causing diverse health issues, including heat rash (miliaria), increased physical pain perception, cardiovascular strain, and altered appetite due to thermoregulation. 15 sources. https://clstr.news/cluster/navarra-weather-shifts-toward-cooler-temperatures-and-storms ### 2026-08-21: Heatwaves increase risks for individuals on specific medications Health experts warn that medications for depression, ADHD, and blood pressure can impair thermoregulation, increasing heat stress risks for humans and impacting agricultural productivity. 4 sources. https://clstr.news/cluster/medications-can-increase-heatwave-health-risks ### 2026-08-17: Heatwaves increase risks for kidney and heart health Medical experts warn that extreme heat and dehydration significantly increase risks for kidney failure and cardiovascular complications, especially for those with pre-existing conditions. 5 sources. https://clstr.news/cluster/extreme-heat-poses-serious-risks-to-kidney-and-heart-health ### 2026-08-14: Heatwaves increase health risks for kidney and dialysis patients Medical experts warn that heatwaves pose severe risks to kidney patients and dialysis users, noting that fluid loss and certain medications can lead to acute kidney damage and electrolyte imbalances. 5 sources. https://clstr.news/cluster/extreme-heat-increases-risk-of-kidney-damage ### 2026-07-31: Heat Exposure Increases Risk of Kidney Injury Extreme heat can dehydrate the body, reducing kidney blood flow and causing acute injury, stones, and infections, especially in the elderly and infants. Ayurvedic cooling drinks are advised to stay hydrated and 2 sources. https://clstr.news/cluster/heat-exposure-increases-risk-of-kidney-injury --- Cite as: Health risks and healthcare impacts of extreme temperatures. CLSTR, https://clstr.news/situations/heat-exposure-health-risks