What happens to seniors that makes them get dizziness more easily or more often?

Changes in BP. Many elderly patients take medications that cause changes in their blood pressure. Quick changes in position from supine to sit to stand may cause a drop in blood pressure which can lead to imbalance, dizziness and sometimes a fall. Changes in the blood vessels may also impair blood flow to the brain and lead to dizziness. Other possible causes may be inner ear problems, heart disease.