Heatstroke, also known as sunstroke, is a medical condition that occurs when your body overheats due to extended exposure to high temperatures, known as non-exertional or classic heatstroke, or while physically exerting yourself in hot weather, known as exertional heat stroke. Sunstroke is a serious medical condition that requires emergency treatment at an urgent care clinic or emergency room. When a person experiences sunstroke, their body temperature rises to 104 degrees Fahrenheit or higher. The symptoms of heatstroke include the following: • Altered behavior or mental state, with agitation, confusion, delirium, disorientation, or irritability • Coma or unconsciousness • Flushed or red skin • Heatstroke brought on by hot weather will cause hot and dry skin to the touch, while heatstroke brought on by strenuous exercise will cause slightly moist skin to the touch • High body temperature of 104 degrees Fahrenheit (40 degrees Celsius) or higher • Muscle weakness or cramps • Nausea and vomiting • Rapid or shallow breathing • Rapid heart rate, which can be either strong or weak • Seizures • Throbbing headache Classic heat stroke most often occurs in older adults or individuals with a chronic illness, while exertional heatstroke can happen to anyone who exercises or participates in intense physical activity in hot weather. Heatstroke is more likely to occur if an individual is dehydrated, drinking alcohol, or wearing excess clothing.