 Finally, Dee says even if you follow her advice to the letter, the heat could still start to get to you. So be sure to pay attention to how you're feeling and thinking. Symptoms of heat problems can include fatigue or dizziness, even irritability, impaired judgment, any type of lack of ability to concentrate. If you notice any of those symptoms, Dee Jepsen says get out of the heat, get cooled down, and get medical help.