The hot summer temperatures can be damaging to our bodies if we're outside too long and don't stay hydrated.
One Sioux Falls man has spent the week recovering after the long stretch of hot weather took a toll on him causing him to suffer what he believes was heat stroke.
On most sunny afternoons Mark Tassler would be out working in his yard but he's not daring to go out now.
"The heat got to me," Tassler said.
After spending a week working in 100 degree heat, topped with sitting at the air show, Tassler started feeling sick.
"I was nauseous, symptoms of flu, dizzy, weak. It was an effort to get up and get out of bed and walk," Tassler said.
After suffering severe muscle pain, he went to Avera McGreevy Clinic where doctors told him the culprit was dehydration and overexertion. Tassler didn't think the heat could overcome him because it's nothing he's shied away from before.
"I’m somewhat embarrassed to do this story because I'm an iron man. I was out in the hot sun all the time. At the race track working on cars, working on my lawn," Tassler said.
That's how the heat sneaks up on many. Avera Doctor Scott Hiltunen didn't treat Tassler, but has seen plenty of cases.
"Heat exhaustion can be dangerous," Hiltunen said.
It happens when your body becomes dehydrated. You might feel dizzy, nauseous, have a headache, or get muscle cramps. The more you're exposed to the heat, the worse it can get. The most severe form is a heat stroke even causes the body to start shutting down.
"The big thing with heat stroke is to not let it get to that point, prevention, make sure you're hydrating with water, cold liquids preferably," Hiltunen said.
Tassler has been taking it easy, staying in the cool and drinking plenty of fluids. While he says he doesn't feel 100 percent, he's getting better.
And as for the yard work, it's no longer going to be the priority it once was.
"When it's really hot I think I might just pace myself and wait for a cooler day," Tassler said.
Tassler says his body is extra sensitive to the heat, doctors say that is normal after suffering a heat related injury.
To reduce the risk of getting heat exhaustion or heat stroke doctors say to take breaks from the heat, drink plenty of fluids and use cold rags or ice packs to keep yourself cool.