Untreated, heat exhaustion can lead to heatstroke. Heatstroke requires immediate medical attention to prevent permanent damage to your brain and other vital organs that can result in death, according to the Mayo Clinic. Heat-related illnesses are preventable.

Below, learn the symptoms of heat exhaustion and heat stroke:

Symptoms of heat stroke:

The graphic below has recommendations on what to do if you or anyone you know is experiencing any of these symptoms: