smartphone thumb

a.k.a. Blackberry thumb, Playstation thumb

The name given to the soreness in one's thumbs and hands from excessively using a smartphone or other handheld device. Similar to "tech neck" and "mouse hand" there are now specialized massages to treat workplace woes. 

Historical perspective: In 2017, doctors saw a surge in a form of tendinitis they're calling "smartphone thumb" according to The Week. Typing rapidly on small keyboards causes abnormal motion of bones in the thumb, causing pain onset and eventual osteoarthritis.

NetLingo Classification: Online Jargon