According to this CNN article, your smartphone may be a serious pain in the neck. The average human head weighs 10 pounds in a neutral position (when your ears are over your shoulders). When you use a mobile device, however, it is probably likely that your head is tilted forward and your shoulders are curved. For every inch you tilt your head forward, though, the pressure on your spine doubles. So if you're looking at a smartphone in your lap, your neck is holding up what likely feels like 20 or 30 pounds and is putting a lot of extra pressure on your spine, possibly leading to muscle strain, disc herniations and pinched nerves. Over time, it can even flatten or reverse the natural curve of your neck.
Now there is even a Text Neck Indicator app to tell you whether or not you are holding your phone at a viewing angle putting you at risk for text neck.
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