Why does my left upper eyelid keep twitching slightly?

Continuous mild twitching of the upper left eyelid may be caused by physiological factors or pathological conditions, such as allergic conjunctivitis or keratitis. Different management approaches should be adopted depending on the underlying cause.

I. Physiological Factors

This may result from frequent熬夜, prolonged reading, extended use of mobile phones or computers, or continuous exposure to bright external light, leading to eye strain and localized dysfunction of the ocular nerves, which causes persistent mild twitching of the upper left eyelid. It is recommended to reduce eye use, perform gentle eye massage, and relieve eye fatigue.

II. Pathological Factors

1. Allergic Conjunctivitis

This condition may arise from using substandard eyeshadow, eye drops, or exposure to allergens such as pollen, dust mites, or animal dander. Inflammation from allergic conjunctivitis can stimulate skin and muscles innervated by the facial nerve, causing involuntary twitching. Treatment may include sodium cromoglicate eye drops, azelastine hydrochloride eye drops, or tobramycin-dexamethasone eye drops, as prescribed by a physician.

2. Keratitis

Keratitis may occur due to prolonged wear of contact lenses, corneal injury, or infection with pathogens such as tuberculosis bacilli or chlamydia. Inflammatory irritation of the cornea can lead to local nerve spasms. Treatment may involve antiviral or antimicrobial eye drops such as entecavir eye drops, ribavirin eye drops, or acyclovir eye drops, under medical supervision.

In addition, this symptom could potentially be caused by cerebral hemorrhage; therefore, prompt medical evaluation and treatment as directed by a healthcare provider are advised.