One eye waters excessively due to overproduction of tears, usually caused by irritation, dryness, or blocked tear ducts. The lacrimal system produces and drains tears continuously, but imbalances cause one-sided tearing.
The lacrimal glands above each eye produce tears, which spread across the eye surface via blinking. Tears drain through tiny openings in the inner corners (puncta) into tear ducts leading to the nose. When this system malfunctions, one eye may water excessively.
Common causes include:
Consult an eye care professional if excessive tearing persists for days, accompanies pain, redness, or vision changes, or occurs after an eye injury. Chronic tearing may indicate underlying conditions requiring treatment.
I once experienced persistent left-eye tearing after a minor allergy flare-up. Though it resolved within days, the discomfort highlighted how disruptive even temporary unilateral tearing can be.
Solutions depend on the underlying cause:
| Cause | Possible Treatment |
|---|---|
| Blocked tear duct | Massage, warm compresses, or surgical intervention |
| Dry eye syndrome | Artificial tears, prescription eye drops, or punctal plugs |
| Eye irritation | Antihistamines, decongestants, or antibiotics |
| Eyelid abnormalities | Surgery to correct positioning |
Preventive measures include protecting eyes from irritants, using humidifiers for dry environments, and practicing good contact lens hygiene if applicable.