How common is heat intolerance in obesity?

The body needs to move heat from its core to the skin and then into the surrounding air. In obesity, physical activity may produce more heat and body insulation can slow heat release. Warm, humid, or poorly ventilated surroundings may therefore feel uncomfortable sooner. Heat intolerance has other possible causes too, including medicines, hormonal conditions, infection, and dehydration.

Choose cooler times of day for activity, build up effort gradually, and take breaks in shade or air conditioning. Wear loose, breathable clothing and have fluids available. A fan, cool shower, or damp cloth can help when you become overheated. Review medicines with a clinician or pharmacist before changing them, since some can affect sweating or fluid balance.

Seek urgent assessment for fainting, confusion, chest pain, severe breathlessness, a seizure, or an inability to stay awake during heat exposure. Arrange a medical review when heat intolerance is new, worsening, affecting daily life, or accompanied by palpitations, unexplained weight change, fever, or persistent sweating changes.

Describe when heat symptoms occur, what activities trigger them, and whether you notice dizziness, sweating changes, or a racing heart. Ask whether your current medicines or another health condition could be contributing, and request advice on a gradual activity plan that suits your tolerance.