Researchers say careless cellphone use can lead to facial cuts, bruises and fractures.
A study published Thursday found a spike in U.S. emergency room treatment for these mostly minor injuries.
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Some cases were caused by phones themselves, including people getting hit by a thrown phone.
But researchers say many injuries were caused by distractions like texting while walking.
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Though most patients in the study weren't hospitalized, experts say the problem should be taken seriously.
The study examined 20 years of emergency room data and found a spike in visits after 2006, around the time when the first smartphones were introduced.