What should you know about vasovagal orthostatic hypotension?

A vasovagal response is often linked to pain, fear, heat, emotional stress, or standing still. Orthostatic hypotension means blood pressure falls when you move from lying or sitting to standing. Blood can briefly pool in the legs before the body adjusts, causing light-headedness, blurred vision, weakness, or a faint feeling.

Both can occur together, but dizziness is not proof of either diagnosis. Dehydration, blood loss, illness, alcohol, medicines, and problems affecting the heart or nervous system may also contribute. A GP can compare symptoms with posture and check blood pressure while you change position.

At the first warning, sit or lie down so you do not fall. Rise in stages: turn on your side, sit at the edge of the bed, move your ankles, then stand while holding a stable surface. Drink fluids if you have not been told to restrict them, avoid overheating, and do not change prescribed medicines without medical advice.

Note whether symptoms start immediately after standing or follow a trigger such as pain or heat. Record meals, fluids, medicines, and any palpitations. These details make a GP consultation more useful.

Seek emergency help for faintness with chest pain, severe breathing difficulty, a new irregular heartbeat, one-sided weakness, confusion, severe headache, serious injury, or an episode that does not settle. Arrange prompt review if symptoms are new, frequent, worsening, or occur during exercise or while lying down. A fall or actual faint also warrants medical advice.

Ask whether your pattern suggests orthostatic hypotension, a vasovagal response, or another cause. Ask whether your medicines, fluid intake, blood count, heart rhythm, or nervous system need review, and request clear instructions for standing, driving, and preventing falls.