Dehydration can precipitate heart attack in susceptible individuals. The normal fluid requirement is 30 ml per kg weight, but the same needs to be increased in the summer because of the loss of fluid from sweating. Apart from water, sodium or salt is also lost. A person, therefore, needs to take more fruits during summer period.

Not passing urine in eight hours, dry armpits, feeling exhausted or feeling weak are suggestive of underlying dehydration. Dehydration can make the blood thick and precipitate heart attack in patients with uncontrolled blood pressure or diabetes.

Walking is a necessity for heart patients and the same should be continued even during peak summer but the timing should be so chosen that peak heat periods are avoided. One can walk early in the morning or late in the evening. People taking anti–allergic pills should take special precautions as they are more likely to get heat stroke.

Heat stroke is a medical emergency leading to charring of organs because of extreme internal heat. A person’s temperature may be more than 105°F.