Why do some people blink excessively? Excessive blinking can be due to problems with the ocular surface (eye irritation, dryness, foreign body in the eye), vision (refractive error), or eyelids. It can also be caused by movement disorders (facial spasms, blepharospasm), habitual tics, and mental and physical stress or fatigue. Serious conditions that can cause excessive blinking include seizure disorders, sensory system issues (stroke and tardive dyskinesia), or neurological conditions (Wilson’s