Persistent eye twitching may be more than a harmless annoyance. While most eyelid spasms are benign, some involve neurological conditions such as blepharospasm or hemifacial spasm. Nutritional deficiencies, electrolyte imbalances, and medications may also contribute to abnormal muscle activity. Learn how doctors distinguish common eyelid myokymia from neurological disorders, which warning signs require evaluation, and what treatments can provide relief.