Why Do My Thumb Muscles Twitch Uncontrollably When I Hold My Phone?
1. Introduction Uncontrollable thumb muscle twitching when holding a phone is typically caused by benign fasciculations resulting from localized muscle fatigue and repetitive strain. The continuous, micro-repetitive motions required for scrolling and typing overwork the thenar eminence, the group of muscles at the base of the thumb. This physiological exhaustion depletes local cellular energy stores … Read more