Hydrocephalus is a build-up of fluid on the brain. The pressure can cause brain damage and, if untreated, it can be fatal. Understanding of its causes is still limited, but babies may be born with it, it may be caused at any age by head injury, or happen for no apparent reason. Common symptoms include headaches, vomiting and blurred vision. Visit shinecharity.org.uk/ hydrocephalus for info.
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