By Memorial Day weekend, heat-related illness becomes a real clinical concern in New York City — particularly for older adults, outdoor workers, and anyone living in a non-air-conditioned apartment. The line between heat exhaustion and heat stroke is the line that matters most.
Heat exhaustion: signs and home management
Heavy sweating. Cool, clammy skin. Fast, weak pulse. Nausea or vomiting. Muscle cramps. Headache, dizziness, fatigue. Body temperature elevated but typically under 104°F. Mental status is normal.
Home management: move to a cool environment, loosen clothing, cool the body with damp cloths or cool shower, sip cool water or electrolyte solution. Most cases resolve within 30-60 minutes of cooling and rehydration.
Heat stroke: the line that has been crossed
The features that change the diagnosis:
— Body temperature 104°F or higher
— Mental status change: confusion, slurred speech, disorientation, seizure, loss of consciousness
— Skin may be hot and dry (classic heat stroke) or hot and sweaty (exertional heat stroke)
— Rapid breathing, racing heart
Heat stroke is a medical emergency. Call 911. While waiting, aggressive cooling — ice packs to neck, armpits, groin; cool water immersion if possible; spray water and fan — buys time. Heat stroke kills when cooling is delayed.
The high-risk groups in NYC
Older adults, especially those on multiple medications including diuretics, beta-blockers, or anticholinergics. Children. Outdoor workers (construction, delivery). People in non-air-conditioned apartments during heat waves. People with chronic illness, particularly cardiovascular disease or diabetes.
The 1995 Chicago and 2003 Paris heat waves are the cautionary public health cases. Excess deaths concentrated in older adults living alone in upper-floor apartments without air conditioning. The clinical lessons translate directly to NYC summers: check on people in this group during heat waves.
When a Sickday clinician helps
For heat exhaustion that does not resolve cleanly with home management, for assessment after recovery, for medication review in patients on regimens that increase heat sensitivity, and for clinical guidance during a heat wave for patients with chronic conditions. For heat stroke, call 911 first, Sickday after.
