· 📍 International
A nationwide analysis published in JAMA Network Open found that intense heat exposure could increase the risk of acute ischaemic stroke within hours, not days. The findings underline the role of dehydration, heat stress, and reduced cerebral circulation — highly relevant as Indian summers grow longer and hotter.
How heat triggers stroke
Heat causes vasodilation in the skin to dissipate warmth, sweating reduces plasma volume, and blood viscosity rises. In someone with pre-existing carotid disease, hypertension, or atrial fibrillation, this combination can tip the balance toward a clot.
Why it matters for you
Symptoms like sudden weakness on one side of the body, facial droop, slurred speech, or sudden vision loss after heat exposure are an emergency. Call a hospital immediately — every minute of delay is brain tissue lost. Note the time symptoms started; it determines whether clot-busting treatment is possible.