Prolonged exposure to elevated temperatures produces measurable physiological changes in the human body. As ambient heat increases, blood vessels near the skin expand to facilitate heat dissipation, which simultaneously lowers blood pressure and forces the cardiovascular system to work more intensively. Concurrent fluid and electrolyte loss through perspiration disrupts the body’s internal mineral balance, potentially resulting in heat exhaustion characterized by symptoms including dizziness, nausea, fainting, confusion, muscle cramps, headaches, and fatigue.
Certain populations face disproportionate vulnerability to heat-related illness. The UK Health Security Agency identifies older individuals, infants and young children, those with pre-existing medical conditions, and people living alone as requiring heightened vigilance. Additional at-risk groups include individuals with limited mobility, those experiencing homelessness with prolonged sun exposure, residents in upper-level residential units, and people with neurological conditions affecting heat awareness or response capacity.
Multiple medications increase susceptibility to heat-related complications. Diuretics enhance bodily fluid expulsion, escalating dehydration and mineral imbalance risks. Antihypertensive drugs combine with naturally dilating blood vessels to produce dangerous blood pressure drops. Certain epilepsy and Parkinson’s treatments impair sweating capacity, while drugs such as lithium and statins become concentrated in the bloodstream when fluid loss occurs.
Heat-related mortality statistics demonstrate significant public health impact. An estimated 2,985 excess deaths occurred during 2022, which recorded England’s highest temperature at 40.3C. Recent years showed estimated 1,311 heat-associated deaths during summer 2024 and an estimated 1,504 during summer 2025. Most heat-related deaths result from cardiovascular events—heart attacks and strokes—triggered by the body’s effort to maintain core temperature stability. Death rates increase notably once temperatures exceed 25C-26C, with evidence indicating the largest surge occurs within the first 24 hours of a heatwave.
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