Hypertension can be diagnosed by performing careful and repeated measures of the blood pressure. Blood pressure categories include normal blood pressure, defined as a systolic pressure less than 120, and a diastolic pressure less than 80. Elevated blood pressure is defined as a systolic pressure 120 to 129, and a diastolic pressure less than 80.
Ideal blood pressure is categorized as normal. Increased blood pressure may be categorized as elevated, stage 1 or stage 2 depending on the specific numbers. A diagnosis of high blood pressure is usually based on the average of two or more readings taken on separate visits.
Normal-pressure hydrocephalus. Most common in older adults, this type causes the brain's ventricles to enlarge, but the pressure of the fluid stays within a typical range. It can affect walking, memory and bladder control. Hydrocephalus ex vacuo. This type happens after brain tissue is lost, often due to a stroke, head injury or another condition.