Smartphone thumb is becoming a major problem in the US

A condition that used to only be seen in factory workers is affecting smartphone users in increasing numbers, experts have warned. The movements that ones thumbs have to make while texting require force, and researchers say that this abnormal thumb bone movement could be causing pain and eventual arthritis. It's most often caused by repetitive, minor impact on the area, or it can be caused by a sudden, more serious injury The formal name for smartphone thumb is tendinitis - an inflammation or irritation of a tendon, a thick cord that attaches bone to muscle, according to WebMD. It causes pain and inflammation of the tendons and can be prevented through daily wrist and finger exercises to keep joints flexible The formal name for smartphone thumb is tendinitis - an inflammation or irritation of a tendon, a thick cord that attaches bone to muscle, according to WebMD. While researchers haven't reached a conclusion about how exactly smartphone thumb causes tendinitis, Dr Zhao's Mayo clinic study is still ongoing.