Does heat exhaustion cause dizziness?

Heat exhaustion may cause lightheadedness, unsteadiness, or a feeling that you might faint. Sweating lowers fluid levels, while heat widens blood vessels near the skin so the body can release warmth. Together, these changes can reduce blood flow to the brain for a moment, especially after standing or exerting yourself. Headache, thirst, weakness, nausea, heavy sweating, and dark urine may occur as well.

Dizziness has many possible causes, including low blood sugar, an inner-ear problem, medicines, infection, or heart and circulation conditions. The timing of symptoms and exposure to heat help guide assessment, but dizziness alone cannot establish the cause.

Stop activity and sit or lie down in a cool place. Loosen extra clothing, cool the skin with a fan or damp cloth, and take small sips of a suitable drink if you are alert and not vomiting. Stand slowly only after you feel steady. Avoid driving, climbing, or returning to exertion until the dizziness has resolved. If it keeps happening, arrange a clinical review.

Call for urgent help if dizziness comes with confusion, fainting, a seizure, severe headache, chest pain, trouble breathing, one-sided weakness, slurred speech, or repeated vomiting. Very hot skin, worsening weakness, or inability to drink after heat exposure also requires prompt care because heat illness can become dangerous.

Ask whether the episode fits heat exhaustion, how to replace fluids safely, when you may resume exercise, and whether blood pressure, glucose, or other checks are appropriate. Describe whether the room spun, you felt faint, or your balance changed, and list any medicines you take.