Differential Diagnosis for Left Eye Watery Discharge with Mild Itching Spreading to the Right Eye
- Single Most Likely Diagnosis
- Allergic conjunctivitis: This is the most likely diagnosis due to the presence of watery discharge and mild itching, which are common symptoms of an allergic reaction. The fact that it's spreading to the other eye also supports this diagnosis, as allergic reactions can affect both eyes.
- Other Likely Diagnoses
- Viral conjunctivitis: This condition can cause watery discharge and itching, and it can spread from one eye to the other. It's often accompanied by redness and a gritty sensation.
- Bacterial conjunctivitis: Although it typically presents with a thicker, more purulent discharge, some bacterial conjunctivitis cases can have a watery discharge, especially in the early stages.
- Dry eye syndrome: This condition can cause itching and watery discharge as the eye tries to compensate for the lack of moisture. However, it's less likely to spread from one eye to the other in a short period.
- Do Not Miss Diagnoses
- Gonococcal conjunctivitis: This is a rare but serious condition that can cause severe conjunctivitis, and if left untreated, can lead to vision loss. It's essential to consider this diagnosis, especially in sexually active individuals.
- Chlamydial conjunctivitis: Similar to gonococcal conjunctivitis, chlamydial conjunctivitis can cause severe symptoms and requires prompt treatment to prevent complications.
- Herpes simplex keratitis: This condition can cause itching, watery discharge, and vision loss if left untreated. It's essential to consider this diagnosis, especially if there's a history of herpes simplex infection.
- Rare Diagnoses
- Phlyctenular keratoconjunctivitis: This is a rare condition that can cause itching, watery discharge, and small nodules on the conjunctiva or cornea. It's often associated with an allergic or immune response.
- Sjögren's syndrome: This autoimmune disorder can cause dry eye syndrome, which may lead to itching and watery discharge. However, it's a rare condition and typically presents with other systemic symptoms.