Why Is Thumb Twitching
BY IGONK, FEBRUARY 16, 2026
Webthumb twitching, also known as thumb fasciculation, is an involuntary movement of the thumb that can be subtle or pronounced. This twitching is usually harmless but can be. Webhave you ever experienced a sudden, involuntary twitch in your thumb?
Thumb twitching can be an annoying and sometimes concerning symptom, but it’s generally harmless.