The most common reasons for the left eye jumping (eyelid twitching) include stress, fatigue, caffeine intake, and eye strain. This involuntary muscle spasm, known medically as ocular myokymia, is usually harmless and temporary. Other factors can include dryness of the eyes, irritation from allergies or environmental factors, lack of sleep, and sometimes side effects of medications. Rarely, persistent twitching can be linked to neurological conditions, but this is usually accompanied by other symptoms. In summary, common causes of left eye twitching are:

• Stress or anxiety
• Fatigue or lack of sleep
• Too much caffeine or alcohol
• Eye strain from prolonged screen use or focusing
• Dry or irritated eyes

If the twitching persists for several weeks, worsens, or occurs with other symptoms like swelling, drooping eyelid, or affects other parts of the face, it is advisable to consult a healthcare professional for further evaluation.