"Text neck" is an umbrella concept to describe the neck (and head) symptoms of those spending too much time on their smartphone (typically to write text messages). The March 2017 issue of the Spine Journal rings the alarm bell: practitionners notice an increase in the prevalence of the issue.
We absolutely agree on the fact that mobile screen devices (smartphones, tablets, etc.) are a health hazard. Our main and most effective recommendation is therefore to limit their usage time. One way to do so is to call rather than to text, another one is to send vocal messages (e.g., via Whatsapp) rather than to type. Teenagers need particular attention from adults in this respect.
Once this is done, it is indeed true that raising the phone helps avoiding a forward head posture. However, holding the phone at eye level may also create strain in the neck and shoulders area. Hence, placing the phone on an elevated surface (e.g., shelf), inclined if possible, is surely a healthier option.
Finally, a good body awareness will help you keeping the neck aligned: make sure that your thoracic spine is not rounded, that your shoulders are not pushed forward, and that you keep your chin drawn slightly inwards. It will also help you slowing down when your body tells you it has enough...
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