Heat exhaustion vs. heat stroke: What to watch for in dangerous heat

Two of the biggest risks in extreme heat are heat exhaustion and heat stroke. Both can come on fast, and in some cases, become dangerous if left untreated.
Published: Jul. 24, 2025 at 10:40 AM CDT

DAVENPORT, Iowa (KWQC) - As temperatures climb across the Quad Cities, the risk of heat-related illness is also on the rise, especially for people spending long periods of time outdoors.

Dr. Michael Craddick with MercyOne Genesis says two of the biggest risks in extreme heat are heat exhaustion and heat stroke. Both can come on fast, and in some cases, become dangerous if left untreated.

Heat exhaustion is typically the body’s early warning sign. Symptoms include:

  • Lightheadedness or dizziness
  • Nausea
  • Muscle cramps
  • Excessive sweating
  • Feeling extremely tired or weak

If you notice any of these symptoms, the best thing you can do is stop what you’re doing, move to a cooler place, drink water, and give your body time to recover.

Heat stroke is much more serious and can be life-threatening. Symptoms include:

  • A high body temperature
  • No longer sweating
  • Confusion or disorientation
  • Vomiting
  • Loss of consciousness

If you or someone around you shows any of these symptoms, call 911 right away.

The key is catching these signs early and not trying to push through them. It’s better to take a break and be cautious than risk a medical emergency.