Why you feel dizzy when you stand up: The surprising causes of morning wooziness and how to stop it

Sudden dizziness upon standing, often in the morning, can signal orthostatic hypotension, a blood pressure drop. This occurs as blood pools in the legs, reducing brain flow. Dehydration, inactivity, and certain meals exacerbate it. Older adults are more vulnerable. Gradual rising, hydration, and meal adjustments can prevent these dizzy spells.