Extreme heat can cause heat exhaustion (characterized by nausea, dizziness and muscle cramps), heatstroke (an elevated core body temperature, often higher than 104 degrees Fahrenheit, which can damage organs if not promptly treated), and even death. Older people, those with certain health conditions or taking certain medications, and outdoor workers are particularly at risk of heat illness. Outdoor laborers can be especially vulnerable because, in addition to the danger posed by the ambient heat, their work often raises their body temperature.