ABILENE, Texas -

Intense heat has arrived and that could mean heat exhaustion if you're not careful.

Hospitals and doctor's offices typically see an increase in cases when it first begins to warm up because our bodies haven't experienced heat like this for several months.

"People think they can spend eight hours out in the heat because that's what they've done all spring but we're talking about temps 20 to 25 degrees hotter," said Dr. Craig Beasley with Dr. J Express Care in Abilene.

The symptoms of heat illness and heat exhaustion can be subtle but are important to notice.

They include lightheadedness, headaches, muscle pains, nausea, and a feeling of faintness.

"The biggest thing is to get out of the heat, get to where it's cool, hydrate, and drink plenty of fluids," Dr. Beasley said.

If the symptoms worsen, it's time to get help.

"If they were feeling like they were gonna pass out and couldn't easily correct it with fluids, if they felt that they couldn't hold down fluids, they were nauseated and vomiting, or they actually passed out, that would be the time to get help," said Beasley.

Spending a lot of time in the heat?

Remember to take lots of breaks, drink a lot of water/sports drinks, and stick to the shade.