Does obesity cause heat intolerance?

The body produces heat during movement and must release it through the skin and breathing. A larger body may retain heat differently, while skin folds and reduced fitness can make cooling and exertion more difficult. Sweating, breathlessness, fatigue, and feeling overheated during activity may occur together.

Heat intolerance is not specific to obesity. Thyroid disorders, infections, menopause, dehydration, some medicines, and nervous-system conditions can also cause increased sensitivity to warmth. The setting, onset, medicines, and other symptoms help a clinician decide whether testing is needed.

Use shade, light clothing, ventilation, and regular fluids during hot weather. Take breaks before exhaustion develops and increase activity gradually in a cool setting. Avoid strenuous exercise in peak heat, and ask a clinician about fluid advice if you have heart or kidney disease. If weight management is part of your care, choose a sustainable plan rather than pushing through overheating.

Book a medical review if heat intolerance is new, worsening, present at rest, or accompanied by palpitations, tremor, unexplained weight change, fever, night sweats, or medication changes. Move to a cool place and seek urgent help for confusion, fainting, seizures, severe weakness, hot dry skin, or inability to drink, as these can signal dangerous heat illness.

Could my medicines or thyroid be contributing? What symptoms should prompt testing? How can I exercise safely in hot weather? Are my heart, kidney, or fluid conditions relevant to hydration advice?