Texas summer heat can be dangerous, especially for visitors unfamiliar with the state's combination of high temperatures and humidity. As World Cup fans spend hours outdoors at matches, fan festivals, and other events, knowing the difference between heat exhaustion and heat stroke could help prevent a medical emergency.

With the summer heat at its peak in the Houston area, it is important to know the signs of heat-related illnesses.

With the summer heat at its peak in the Houston area, it is important to know the signs of heat-related illnesses.

Houston faces extreme heat warnings as the heat index is expected to reach or exceed 108° next week.