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." Typing rapidly on small keyboards causes abnormal motion of bones in the thumb, causing pain onset and eventual osteoarthritis. - As seen in The Week

NetLingo Classification: Online Jargon