When your left eye twitches, it usually means an involuntary spasm of the eyelid muscles, medically called myokymia. This is a common and generally harmless condition that can be triggered or worsened by several factors:

• Stress or anxiety
• Fatigue or lack of sleep
• Eye strain, often from prolonged screen time
• Excessive caffeine or alcohol intake
• Dry or irritated eyes, allergies, or environmental irritants
• Nutritional deficiencies such as low magnesium or potassium
• Side effects of certain medications

Most eye twitches, including those in the left eye, are temporary and resolve on their own without treatment

. In rare cases, persistent or severe twitching could be a sign of more serious neurological conditions like Parkinson’s disease, Bell’s palsy, or multiple sclerosis, but these usually come with other symptoms as well

. Culturally, left eye twitching is sometimes associated with superstitions about bad luck or misfortune in many parts of the world, though these beliefs vary by culture and have no scientific basis

. In summary, a twitch in the left eye most often signals temporary muscle irritation or fatigue, often related to lifestyle factors, and is not typically a cause for concern. If the twitching is persistent, severe, or accompanied by other symptoms, consulting a healthcare professional is advisable.