The cerebrospinal fluid (CSF) accumulation in the brain is a disorder known as hydrocephalus. Usually, this raises the pressure inside the skull. Headaches, double vision, unstable gait, urine incontinence, personality changes, and mental impairment are all shared in older adults. It may appear as a sudden rise in head size in infants. Other signs may include nausea, fatigue, convulsions, and eyes that point downward.