With over 2.19 trillion text messages sent annually, there’s a little known condition that is plaguing smartphone users known as "text neck." The injury involves stiffness in your neck and shoulders and typically is caused by excessive smartphone usage.
A 2011 study published in the International Journal of Occupational Safety and Ergonomics found that 53 percent of mobile phone users suffer numbness or neck aches. Another study led by Erik Peper of San Francisco State University showed that 84 percent of subjects reported some hand and neck pain during texting. Moreover subjects also displayed other signs of tension, like holding their breath and increased heart rates.