noun
text neck; smartphone neck
Colloquial term for neck pain or injury caused by prolonged forward head posture while using a smartphone or similar device.
最近、スマホ首で肩こりがひどい。
Lately, my shoulder stiffness is terrible because of text neck.
スマホ首を防ぐには、画面を目の高さに持ってくるといいらしい。
To prevent text neck, it seems good to bring the screen up to eye level.