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False medical news can lead to patients’ experiencing greater side effects through the “nocebo effect (反安慰剂效果)”. Sometimes patients benefit from an intervention simply because they believe they will- -that’s the placebo effect. The nocebo effect is the opposite: Patients can experience negative effects just because they expect them. This is very true of statins. In blinded trials, patients who get statins are no more likely to report feeling muscle aches than patients who get a placebo. Yet, in clinical practice, according to one study, almost a fifth of patients taking statins report side effects, leading many to discontinue the drugs.

What else is on the fake news hit list? As always, vaccines. False concerns that the vaccine for the virus called human papilloma virus causes seizures (癫痫) and other side effects reduced coverage rates in Japan from 10 percent to less than 1 percent in recent years.

Cancer is another big target for pushers of medical misinformation — many of whom are making money off alternative therapies. “Though most people think cancer tumors are bad, they’re actually the way your body attempts to contain the harmful cells,” one fake news story reads. It suggests that surgery increases the risk of spreading harmful cells.

Silicon Valley needs to own this problem. When human health is at risk, perhaps search engines, social media platforms and websites should be held responsible for promoting or hosting fake information. The scientific community needs to do its part to educate the public about key concepts in research, such as the difference between observational studies and higher quality randomized trials.

Finally, journalists can do a better job of spreading accurate information. News sites are more likely to cover catchy observational studies than randomized controlled trials, perhaps because the latter are less likely to produce surprising results. Such coverage can overstate benefits, claiming for example, that statins could cure cancer; it can unduly emphasize potential risks, such as suggesting a misleading connection with dementia, a serious mental disorder.