why is my left eye twitching

The most common reasons for left eye twitching are generally benign and often linked to fatigue or lack of sleep, stress or anxiety, excess caffeine or alcohol intake, eye strain, or irritation of the eye surface or inner eyelids. Environmental factors like bright light, wind, or air pollution can also contribute. This twitching is usually harmless and called eyelid myokymia, involving involuntary spasms of the eyelid muscles. Less commonly, persistent or severe twitching might be a sign of underlying neurological conditions such as benign essential blepharospasm, hemifacial spasm, or other disorders affecting the nervous system, but these are typically accompanied by additional symptoms. If the twitching persists for more than a few weeks, causes the eyelid to close completely, spreads to other parts of the face, or comes with redness, swelling, or discharge from the eye, it is important to seek medical evaluation.