Which is the earliest sign of heat illness?

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Heat cramps are the earliest sign because they reflect the initial phase of heat illness driven by dehydration and electrolyte loss from sweating. The painful muscle cramps—often in the calves, thighs, or abdomen—typically appear during or shortly after strenuous activity in hot conditions and indicate that the body’s balance of fluids and salts is being disrupted. If this early signal isn’t addressed, it can progress to more serious heat illnesses such as heat exhaustion (with fatigue, dizziness, heavy sweating, and cooler moist skin) or heat stroke (altered mental status and dangerously high core temperature). Heat rash, by contrast, is a superficial skin irritation from sweating and doesn’t represent the systemic onset of heat illness. So cramps represent the initial warning sign among the options. In management, move to a cooler environment, rest, and rehydrate with electrolytes to help reverse the imbalance and prevent progression.