Untreated, heat exhaustion can lead to heatstroke, a life-threatening condition that occurs when your core body temperature reaches 104 F (40 C) or higher. Heatstroke requires immediate attention to prevent permanent damage to your brain and other vital organs that can result in death.

A silent stroke is caused by brain arteries becoming blocked or damaged, thereby disrupting blood flow to the brain and causing cell death. They differ from other strokes because they don't present any symptoms.

Once the type of stroke, area of the brain affected, and extent of damage are known, treatment options can be chosen.