Overuse of smartphones can cause slipped discs

Stannis

According to the Korean National Health Insurance Corporation, the number of patients with cervical disc herniation (or slipped disc) has increased from 573,912 in 2007 to 784,121 in 2011. Out of 100,000 patients, 7.6 percent of them are in their twenties.

Most people look down when using their mobile devices. This posture adds a strain to the neck and causes cervical disc herniation. Whilst a human head weighs approximately 10 pounds (4.5kg), staring at a phone with your head tilted forward will feel more akin to a 20 to 30-pound (9kg to 13.6kg) load.

http://asia.cnet.com/overuse-of-smartphones-can-cause-slipped-discs-62221857.htm