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Heatstroke occurs when the body's internal temperature-control system gets overwhelmed. Signs that this may be happening include confusion, disorientation and hallucinations. Sometimes (but not always) the body becomes so dehydrated that it will stop sweating altogether. If that happens, you've got a real medical emergency that requires immediate professional attention.
The best defense is to avoid overheating in the first place. Remember, it usually takes a week or two to adjust to any major jump in temperature. Try to avoid exercising in the hottest part of the day. Wear loose-fitting clothing that allows air to circulate around your body. And be sure to drink plenty of liquids.
The elderly and the young are especially vulnerable to heat stress. So are folks who are overweight or suffer from heart disease. Whatever you do, don't ignore the signs of heat stress in yourself or those around you. When the thermometer's rising, everyone's at risk.
See Dr. Ian on NBC's Today show; e-mail ianmedical@aol.com