What are common conditions that can lead to bilateral eye swelling?

Bilateral eye swelling can commonly occur due to conditions that affect both eyes simultaneously, such as conjunctivitis, sinusitis, upper respiratory infections (URI), and allergic rhinitis.

Conjunctivitis, which can be viral or allergic in nature, often leads to redness, swelling, and discharge from both eyes. Sinusitis can cause periocular edema due to the close anatomical relationship between the sinuses and the eyes, especially if there is fluid buildup or infection within the sinuses. Upper respiratory infections also often present with associated nasal congestion and inflammation, which can contribute to swelling around the eyes. Allergic rhinitis causes inflammation and swelling in response to allergens, which can manifest as bilateral eye swelling along with other symptoms like itching and redness.

Other conditions listed may cause swelling but are often unilateral or have specific circumstances. For example, blepharitis and keratitis primarily affect the eyelids or cornea and may not always lead to bilateral swelling. Skull fractures could lead to localized swelling and possibly affect one eye more than the other, while thyroid disease may cause changes in the eyes, but these conditions typically involve more complex presentations. Injury and infection can also lead to swelling, but again, these are often localized rather than bilateral unless there is a