Hydrocephalus is a fluid buildup in the cavities of the brain. This fluid buildup puts pressure on the brain tissue, and only needs a short time to damage the brain. The condition is mostly seen in infants and people over the age of 60, but can occur in every age group. The compression of the brain is serious, and can result in permanent brain damage if left untreated. There are a lot of different reasons for fluid build up, including injuries, birth defects, and infections. Symptoms to look for include seizures, nausea, vomiting, or blurred vision.