Chemosis

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Chemosis is the swelling (or edema) of the conjunctiva. It is usually caused by allergies or viral infections, as well as eye rubbing. Chemosis is also included in the Chandler Classification system of orbital infections.

Other causes of chemosis include:

• superior vena cava obstruction, accompanied by facial edema.
• hyperthyroidism, associated with Exophthalmos, periorbital puffiness, lid retraction, and lid lag.
• cavernous sinus thrombosis, associated with infection of the paranasal sinuses, proptosis, periorbital edema, retinal hemorrhages, papilledema, extraocular movement abnormalities, and trigeminal nerve sensory loss.
• Cluster headache
• Trichinellosis

Treatment depends on the cause of the chemosis.

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