Doctors have a warning for you. A dangerous parasite is showing up in sushi.

The condition anisakiasis is caused when a worm attaches to the lining of your stomach. Anisakiasis could lead to a fever, vomiting, digestive bleeding and even life-threatening reactions.

Anisakiasis is most commonly found in areas where eating raw fish is popular, such as Japan. It is rare in the United States, but there are more and more cases involving the parasite in western countries. So keep that in mind if you travel this summer.

Whether there's a bug going around or not, you should always be aware of what you're eating. Here’s what you can do to be proactive.

First, do a little research. Find a reputable restaurant and don't be afraid to ask them where they get their fish from.

If you're making sushi yourself, you need to do some planning. Buy thinly-sliced "sashimi-grade" fish. After you roll it up, pop it in the freezer for about a week, just to be safe.

The FDA says when it doubt, just cook it. It’s the safest way to eat seafood.

The FDA has videos and tips on how to safely select and serve seafood on its website.

TAP HERE to learn more about Anisakiasis from the Centers for Disease Control and Prevention.

TAP HERE to read the study in BMJ Case Reports.