One Eye Watering
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This can happen when the eye is inflamed or irritated, such as when you have allergies or an eye infection. Excess tears are the body's attempt to wash away whatever is irritating the eye. If tearing is only in one eye, it may also be due to a blockage in the drainage duct.

Seek professional care if you experience any of the following symptoms

• Headache

• Fever

• Unilateral blindness

• Conjunctival redness

• Eye pain

• Blurring of vision

Generally, One eye watering can be related to:

• Cluster Headache

  This condition involves repetitive brief headaches that occur as episodes of severe pain (typically on one side of the head) associated with possible eye redness/tearing or runny nose. These episodes happen in bouts or "clusters" of several per day, potentially lasting for weeks or even months in a row. The pain can be disabling and greatly interfere with daily life.

• Intraocular Foreign Body

  Intraocular foreign bodies are unintentional projectiles that are retained in the eye and require urgent diagnosis. If left unattended, they may lead to vision loss and blindness.

• Migraine

  A type of headache that typically presents as throbbing, pulsating pain on one side of the head, sometimes with associated nausea or sensitivity to light and sound. Sometimes, sensory disturbances, such as vision changes (seeing flashing lights or zigzag lines), can occur before the headache. The pain may worsen on exposure to bright lights or loud noise. Triggers for migraine include stress, poor sleep, caffeine, and hormonal changes in women.

• Common Cold (Upper Respiratory Tract Infection)

• Uveitis

• Allergic Rhinitis / Allergic Conjunctivitis (Including Spring Catarrh)
• Sinusitis

Sometimes, One eye watering may be related to these serious diseases:

• Acute Glaucoma Attack

  A condition caused by high pressures in the eyeball, more common in people with farsightedness. Persons of Black, Asian, or Hispanic descent are at higher risk. The high pressures can cut off blood flow to the eye. Prompt medical attention is needed to prevent permanent blindness.

• Endophthalmitis