Cerebral edema is an excess of fluid in the brain, either within the cells or outside the cells. It has a number of causes including trauma, cancer, stroke, encephalitis and meningitis. It is usually accompanies by vomiting, nausea, fainting, blurred vision, seizure and even coma.

It can be treated in a number of ways, including drugs that change the osmotic pressure between cells, the use of diuretics, steroids and surgery.

Cerebral edema at Wikipedia

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