As flood waters begin to recede in Houston and areas affected by Hurricane Harvey, health concerns arise.

"Some were serious, chest pains, but a lot were chronic medical problems as well as injuries that resulted from the hurricane," said Dr. Eric Higginbotham of UT’s Dell Medical School.

He, along with several others with CommUnity Care, has been treating those affected by the recent storm.

"When people are outdoors trying to clean this stuff up, we see a lot of dehydration," said Higginbotham.

The threat of Hurricane Harvey didn't end when it moved out of state. It continues through the damage it left behind.

In a span of a few days, Harvey dumped trillions of gallons of water into Texas and parts of Louisiana. That amount of water takes a while to drain, which invites swarms of unwelcome guests -- mosquitoes.

"That is going to bring out a specific type of mosquito, known as floodwater mosquitoes,” explained entomologist Wizzie Brown. "Fortunately, they're not the huge disease carriers that we're constantly talking about, but they're very aggressive and voracious biters."

Doctors have seen evacuees covered in those bites.

"We've seen a handful of kids here that have just had multiple mosquito bites, and they're coming in with itching and sort of scratching," Higginbotham said.

Though not serious, health experts warn that just because a different species has taken over, it doesn't mean disease carriers aren't around.

"When these floodwater species die off, then we're going to see the normal mosquitoes that we have that we call 'container breeding mosquitoes,’” Brown warned. “So, make sure that you continue to dump the standing water, or treat the standing water."

Insect repellent helps too. Also, be mindful of your drinking water, which could cause water-borne infections if contaminated.

"You'll want to listen to your local community and make sure that they're not telling you that there's no trouble with your drinking water," Higginbotham said.

If you're heading home to clean up, the CDC recommends that you wear rubber boots and gloves for protection. Coming into direct contact with debris can put you at risk of infection, like tetanus.

Also, the FDA recommends throwing away any prescription drugs that have made contact with floodwater.