Seeking Online Medical Advice? Google's Top Results Aren't Always On Target

Jul 17, 2017
Originally published on July 17, 2017 11:30 pm

My wife is pregnant, and I'm terrified. I don't even have a baby yet, but I have an untold number of questions and concerns that wake me up in the middle of the night. And as I lie awake, I inevitably dive down a Google rabbit hole searching for information.

And Google usually has an answer in a little box at the top of the search results. The information is displayed in a concise, easy-to-understand way, making it an attractive solution for filling in knowledge gaps. But look closer, and you'll see that some answers contradict themselves, others come from questionable sources and sometimes they contain factual errors.

Take, for example, the answer to the question, "Can pregnant women eat eggs?"

Citing a site called Mom Junction, Google says:

"During your pregnancy, you need to cook eggs properly until both the white and yolk turn solid. It, therefore, kills the bacteria and makes eggs a safe option to eat. Though salmonella poisoning will not harm your baby, it can be unpleasant for you as it could cause: Abdominal pain."

According to Dr. Leena Nathan, an OB-GYN at UCLA Health, that answer is only partially correct. Yes, she says, pregnant women should cook their eggs completely; otherwise they risk being infected with salmonella. But, Mom Junction gets the second part of the answer wrong. A baby can be in grave danger if the mother is infected with the bacteria.

"In the first trimester it can actually cause miscarriage if you develop one of these bacterial gastroenteritides. You can definitely lose the pregnancy because of it," Nathan says. She's seen it happen.

After I reached out to Mom Junction for comment, they changed the answer from "will not" to "unlikely," a correction that Nathan agrees with.

It's not just anxious parents-to-be that are Googling health-related questions. People have been turning to the Internet for medical answers for years, and misinformation is nothing new.

"I would say on any given day, it's probably at least 50 percent of patients who say something about the Internet," says Dr. Lara Hart, an OB-GYN at Northside Hospital in Atlanta. "Probably less than 25 percent of the time does it end up being a reputable source."

What is new are Google's featured snippets, or the answer boxes at the top of the search page, which were introduced in 2014.

When someone submits a query, Google's algorithms parse relevant search results for an answer. The text is pulled directly from sites that Google thinks best address what the user wants to know. And different users can get different results for the same question.

"Google actually doesn't know what's true and what's not true," says Danny Sullivan, who's looked into the issue of false information in featured snippets for his website, Search Engine Land.

But it's not just falsehoods that users have to contend with.

Ask one question and another will be suggested by the search engine, but sometimes the answers to those related questions contradict one another.

Take for instance the snippets about colloidal silver, a popular homeopathic supplement trumpeted by the likes of Gwyneth Paltrow and sold at stores like Whole Foods. It's silver particles in water.

Check out the search results: The Mayo Clinic writes that colloidal silver is unsafe, while the WebMD result is unclear. champions its health benefits.

According to the National Center for Complementary and Integrative Health, part of the National Institutes of Health, colloidal silver can be dangerous and could potentially lead to a condition called argyria, where the user's skin takes on a blue tone.

But ask Google if colloidal silver is safe and the NCCIH website doesn't show up until near the bottom of the first page, below the result from

It matters what shows up in search results, because that information shapes people's opinions, research shows.

Henry Brighton, an assistant professor of cognitive science and artificial intelligence at Tilburg University in the Netherlands, saw this first hand in a survey that he conducted in Germany. He asked 289 subjects about the measles, mumps and rubella vaccine and whether they thought that it was a good or bad thing. He asked them to search for information online to help form an opinion, but he manipulated what they could see. For some, he prioritized negative information about the vaccine, while others saw mostly positive results.

In the end, user opinions skewed toward whichever search results had been prioritized.

"The ordering is everything," Brighton said. "So, the big finding is the degree to which we can manipulate people's health care decisions, even when these issues are really, really important, and we can do that simply by changing the rankings of search results."

When Google was asked what responsibility the company has to provide factually accurate snippets, the company responded, "Since the early days of Search, our goal has been to provide people with access to relevant information from the most reliable sources available. And while we may not always get it right, we're making good progress in tackling the problem."

There are trillions of queries submitted to Google each year, but it's unclear how many of those include featured snippets according to a spokesperson for the company. When asked how many of them might be incorrect, they were unable to provide that information as well.

In recent months, the company has implemented a new feature that lets users flag bad results.

Nathan and Hart recommend that if you have a medical question, ask your physician. But if you're going to look up information online, make sure that it is actually from a reputable source.

Jacob Margolis reports on science for member station KPCC. You can follow him @jacobmargolis.

Copyright 2017 Southern California Public Radio . To see more, visit Southern California Public Radio .


It seems like you can find just about anything through Google. If you type a question in the search box, you get an answer and something called a featured snippet. Google's answers are handy, but sometimes they're just wrong. Jacob Margolis from member station KPCC reports.

JACOB MARGOLIS, BYLINE: My wife Rachel and I traveled through Spain recently. The food was delicious. I mean, there were cheeses, fresh fruits, cured meats, great runny egg dishes, and that was only breakfast. But we ran into some problems.

RACHEL MARGOLIS: There's a lot of, like, stress with eating.

J. MARGOLIS: That's Rachel. She's pregnant. And the entire trip we were trying to figure out what she could and could not eat.

Can you eat prosciutto?


J. MARGOLIS: Can you eat salami?

R. MARGOLIS: I don't know. I don't think so.

J. MARGOLIS: Can you eat bacon?

R. MARGOLIS: I think I can eat bacon 'cause it's cooked.

J. MARGOLIS: Can you eat buffet eggs?

R. MARGOLIS: Well, I don't know. I just ate them.

J. MARGOLIS: And like any terrified first-time parents, we turned to Google for answers. But as we looked at the results, I noticed that some of the answers were questionable and that some of them were flat-out wrong. So to find out more, I called up Dr. Leena Shankar Nathan, an OB-GYN at UCLA Health. I looked up the question, can pregnant women eat eggs? Here's what Google had to say.

COMPUTER-GENERATED VOICE: According to MomJunction, during your pregnancy you need to cook eggs properly until both the white and yolk turn solid.

J. MARGOLIS: That's true, says Nathan, because salmonella poisoning is a concern. But MomJunction continues.

COMPUTER-GENERATED VOICE: Though salmonella poisoning will not harm your baby, it can be unpleasant for you as it could cause abdominal pain.

J. MARGOLIS: Salmonella poisoning can actually be very dangerous for pregnant women. After I asked MomJunction about the post, they changed it to say that it's unlikely to harm your baby.

LEENA SHANKAR NATHAN: Because in the first trimester it can actually cause miscarriage if you develop one of these bacterial gastroenteritides (ph). You can definitely lose the pregnancy because of it.

J. MARGOLIS: Dr. Nathan says that she hears from patients all of the time they get bad information from the Internet. And that's nothing new. What is new is Google's featured snippet, or the little answer at the top of search results. The product came about in 2014. And like we just heard, there can be factual issues with them.

DANNY SULLIVAN: You've had cases where people have done searches for, say, the king of America and it has come up with an answer like Barack Obama.

J. MARGOLIS: That answer's since been fixed. But Danny Sullivan's been looking into the results for his website Search Engine Land. The answers that Google displays don't necessarily have editorial oversight. The sources aren't always reputable. And whatever shows up in the snippet box was chosen by Google's algorithms.

SULLIVAN: When someone does a search, an ask or something, it goes through and it tries to find pages that seem like they're answering the question that you have. But it can't actually tell whether or not that's the right answer.

J. MARGOLIS: And research indicates that opinions are shaped by whatever shows up at the top of the search results.

HENRY BRIGHTON: The ordering is everything.

J. MARGOLIS: That's Dr. Henry Brighton from Tilburg University in the Netherlands. He surveyed a group of people who were undecided about whether the measles, mumps and rubella vaccine was a good thing. He asked them to search for information online to help them form an opinion, but he manipulated what people could see. For some he prioritized negative information on vaccines, while others saw mostly positive results.

BRIGHTON: We can manipulate people's health care decisions even when these issues are really, really important. And we can do that simply by changing the rankings of search results.

J. MARGOLIS: Google says that there are trillions of searches done each year on its platform, but that it's unclear how many snippets there are and how often they're wrong. But the company does recognize that bad answers can be an issue, and they've addressed that by letting users flag bad snippets. But if a user doesn't know an answer is wrong, why would they do that in the first place? When asked, Dr. Nathan recommends that if you have a medical question you should check with your doctor. Jacob Margolis, NPR News. Transcript provided by NPR, Copyright NPR.