Myokymia

An involuntary, spontaneous, localized, rippling or quivering of skeletal muscle fibers, typically affecting small muscle bundles, producing continuous or intermittent fine contractions that are visible clinically but generally insufficient to cause joint movement or overt limb displacement. Possible triggers are stress, anxiety, fatigue, exhaustion, lack of sleep, excessive caffeine or alcohol intake, eye strain due to prolonged screen time, eye surface irritation, dry eyes, hypokalemia, hypomagnesemia, and rarely neurological pathology (multiple sclerosis, brainstem tumor, radiation-induced nerve damage, peripheral nerve hyperexcitability).