Overusing your neck,

Overusing your neck, back and shoulder muscles causing strain on your spine leads to text neck. It usually occurs when looking forward and downward for extended periods of time on any mobile device or object such as a cell phone, computer, e-reader, etc.

With an average adult head weighing 10-12 pounds, tilting the head down increases the gravitational pull on the skull. Long-term forward neck posture may lead to long term muscle strain, disc herniation and pinched nerves.