Overview
Low blood pressure means the pressure of blood in the arteries is lower than normal. For many people it causes no problems and needs no treatment. It becomes important when it drops enough to reduce blood flow to the brain, causing dizziness or fainting, especially on standing up. Sudden severe low pressure can be a sign of dehydration, blood loss or infection and needs urgent attention.
Symptoms
- Dizziness or light-headedness, especially on standing
- Blurred vision
- Fainting or near-fainting
- Fatigue and difficulty concentrating
- Nausea and cold, clammy skin
When to see a doctor
See a doctor if you faint, feel dizzy often, or if low readings come with other symptoms.
Emergency — call 108 or go to the nearest hospital
- Confusion, cold clammy pale skin, rapid shallow breathing or fainting that does not recover — signs of shock, call 108 immediately
Causes
Dehydration, standing up quickly, prolonged bed rest, some medicines, heart problems, hormonal conditions, and blood loss or infection when sudden.