What causes constant tearing of the eyes?

Generally, persistent eye tearing may be related to physiological tear reflex, eye strain, conjunctivitis, dry eye syndrome, or lacrimal duct obstruction. It is recommended to seek timely medical attention to determine the underlying cause and receive appropriate treatment under the guidance of a qualified physician. Detailed explanations are as follows:

1. Physiological Tear Reflex

When the eyes are exposed to external stimuli such as bright light, cold wind, or foreign objects, the protective tear secretion mechanism of the eyes may be triggered to help protect the eyeballs from injury. It is recommended to take appropriate protective measures, such as wearing protective goggles, when exposed to substances that may irritate the eyes.

2. Eye Strain

Prolonged focus on electronic device screens or engagement in close-up work may lead to dryness and fatigue in the eyes, which can stimulate tear production. Regular eye rest and exercises are recommended during daily routines to alleviate eye discomfort.

3. Conjunctivitis

Conjunctivitis is an inflammation of the conjunctiva caused by bacteria, viruses, or allergens. The inflammation causes conjunctival congestion and edema, which can stimulate the lacrimal gland to secrete tears, resulting in excessive tearing. It is commonly accompanied by symptoms such as foreign body sensation, burning sensation, and increased eye secretions. Patients should follow medical advice to use medications such as erythromycin eye ointment, tobramycin eye drops, or acyclovir eye drops for treatment.

4. Dry Eye Syndrome

Dry eye syndrome is usually caused by insufficient tear production or excessive tear evaporation. Dryness caused by dry eye syndrome can easily stimulate the lacrimal gland to secrete tears to compensate for the tear deficiency, leading to tearing. It is typically accompanied by symptoms such as eye fatigue, stinging, and blurred vision. Patients may use medications such as sodium hyaluronate eye drops, hydroxycarbamide eye drops, or diquafosol sodium eye drops, as recommended by a doctor, to relieve discomfort.

5. Lacrimal Duct Obstruction

Lacrimal duct obstruction is commonly caused by inflammation, trauma, or congenital developmental abnormalities of the lacrimal passages. Blockage of the tear ducts prevents tears from draining normally, causing them to accumulate in the eye and stimulate the lacrimal gland to produce more tears. Symptoms such as eye swelling, increased secretions, and tenderness in the lacrimal sac area may also occur. Patients may use medications such as brimonidine tartrate eye drops, fluconazole eye drops, or levofloxacin hydrochloride eye drops under medical guidance for treatment.

Maintaining a regular sleep schedule and healthy lifestyle habits is important in daily life. A balanced diet rich in foods containing vitamin A and lutein can help maintain eye health.