Long-term effects of heat exhaustion

Heat exhaustion develops when heat exposure and fluid loss overwhelm the body's ability to cool itself. Excessive sweating, thirst, headache, weakness, dizziness, and dark urine can occur. Most people improve after moving to a cool place, resting, and replacing fluids. A person may still feel drained or unusually sensitive to heat for a period after the event, especially if dehydration was substantial.

Repeated episodes can signal difficult working conditions, inadequate fluid intake, medication effects, or an underlying health issue. Symptoms that do not improve should not automatically be attributed to heat; infection, low blood pressure, and other problems can feel similar.

Cool your body, rest, and drink fluids gradually; oral rehydration may help when sweating has caused salt loss. Return to exercise and outdoor work in stages, with breaks in shade or air conditioning and light clothing. Plan fluids before heat exposure and monitor urine colour as a rough hydration clue. Review medicines with a clinician if heat intolerance or repeated dizziness began after a change. Do not use alcohol as part of rehydration.

Call emergency services for confusion, collapse, seizure, loss of consciousness, very hot skin, or inability to drink, because these may indicate heatstroke. Seek same-day care for persistent vomiting, worsening headache, severe dizziness, very dark urine, or symptoms that fail to improve after cooling and fluids. Arrange a review when heat intolerance or exhaustion keeps returning.

Ask whether dehydration has fully resolved, whether medicines or health conditions increase heat risk, and how to plan activity safely. Discuss workplace precautions, fluid choices, and which symptoms should prompt urgent help.