If chemosis has occurred due to excessive rubbing of the eye, the first aid to be given is a cold water wash for eyes.Other causes of chemosis include:

Superior vena cava obstruction, accompanied by facial oedema
Hyperthyroidism, associated with exophthalmos, periorbital puffiness, lid retraction, and lid lag
Cavernous sinus thrombosis, associated with infection of the paranasal sinuses, proptosis, periorbital oedema, retinal haemorrhages, papilledema, extraocular movement abnormalities, and trigeminal nerve sensory loss
Carotid-cavernous fistula - classic triad of chemosis, pulsatile proptosis, and ocular bruit
Cluster headache
Trichinellosis
Systemic lupus erythematosus (SLE)
Angioedema
Acute glaucoma
Panophthalmitis
Orbital cellulitis
Gonorrheal conjunctivitis
Dacryocystitis
Spitting cobra venom to the eye
High concentrations of phenacyl chloride in chemical mace spray
Urticaria
Trauma
HSV Keratitis
Post surgical
Mucor
Rhabdomyosarcoma of the orbit

Diagnosis
An eye doctor may most often diagnose chemosis by doing a physical examination of the affected area. They can also ask questions about the severity and length of other symptoms. Treatment
Treatment depends on the cause of the chemosis. References


== External links ==
California encephalitis orthobunyavirus type strain California encephalitis virus was discovered in Kern County, California, and causes encephalitis in humans. Encephalitis is an acute inflammation of the brain that can cause minor symptoms, such as headaches, to more severe symptoms such as seizures. Mosquitoes serve as its carrier and for this reason this virus is known as an arbovirus (arthropod-borne virus). California encephalitis orthobunyavirus belongs to the Bunyavirales order of viruses. The La Crosse Virus from the same genus is also a common cause of encephalitis in the United States. Other viruses with similar disease symptoms but genetically unrelated include: Saint Louis encephalitis and West Nile virus. Signs and symptoms
The incubation period of California encephalitis is usually 3–7 days. An early symptoms phase of 1–4 days commonly precedes the onset of encephalitis, manifesting as fever, chills, nausea, vomiting, headache, lethargy and abdominal pain.The encephalitis is characterized by fever, drowsiness, and lack of mental alertness and orientation. Seizures occur in 50% of children. Focal neurologic findings, like focal motor abnormalities and paralysis, irregular and abnormal reflexes develop in 20% of children. 10% of patients develop coma. The total duration of illness rarely exceeds 10–14 days. Recurrent unprovoked seizures occur even after the illness has passed develops in 20% of patients, especially those who had seizures during the acute illness.