Final answer:
Option 4). The absence of sweating is a symptom of heat stroke, differentiating it from other heat-related illnesses that include sweating even in high body temperatures. Sweating is a cooling mechanism that fails during heat stroke, making it a condition that must be medically treated immediately.
Step-by-step explanation:
Sweating is a condition that isn't a sign of heat stroke. When the body cannot control its temperature and overheats to the point where its cooling systems, such as sweating, malfunction, it can result in heat stroke, a serious heat illness. Heat stroke symptoms do not include sweating; instead, they can include fever, headaches, and nausea. In fact, one of the main indicators of heat stroke is the lack of sweating despite elevated body temperatures. This illness needs to be treated right away because it has the potential to be fatal. Electrolyte deficiency, which can induce nausea, exhaustion, and dizziness, is one of the conditions that can result from excessive sweating without sufficient fluid and electrolyte replacement. Sports drinks are frequently advised to aid in the speedy restoration of electrolytes.