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when blood pressure drops suddenly

low blood pressure signals an underlying problem, especially when it drops suddenly or is accompanied by signs and symptoms such as:

Dizziness or lightheadedness
Fainting (syncope)
Blurred vision
Nausea
Fatigue
Lack of concentration

Blood pressure is a measurement of the pressure in your arteries during the active and resting phases of each heartbeat.

Systolic pressure. The top number in a blood pressure reading is the amount of pressure your heart generates when pumping blood through your arteries to the rest of your body.

Diastolic pressure. The bottom number in a blood pressure reading refers to the amount of pressure in your arteries when your heart is at rest between beats.