Brain edema is extra fluid packed into brain tissue, pushing the brain against the skull. Pressure climbs fast and shows early signs anyone can spot. The first sign is a squeezing headache that feels like your head is in a vise. It is worst when you lie flat or bend over and may wake you from deep sleep. Vision blurs next. Lights seem too bright, colors wash out, and you see double for a few seconds. Closing one eye does not clear the blur. Nausea hits hard. You feel seasick without moving and may throw up suddenly, often with no... Learn more