Pulse and orthostatic hypotension

When you stand, gravity shifts blood toward the legs. The body normally adjusts circulation, but dehydration, illness, heat, prolonged bed rest, or some medicines can make that adjustment less effective. The pulse may rise, stay similar, or occasionally become irregular; the pulse by itself does not confirm the diagnosis. Clinicians compare symptoms and blood pressure and pulse while lying or sitting and then standing.

Move from lying to sitting, pause, then stand while holding a stable surface. Drink fluids unless a clinician has restricted them, avoid overheating, and limit long periods of standing. Sit or lie down as soon as light-headedness begins. Do not stop prescribed medicines without medical advice. Keep a record of posture, symptoms, pulse readings, fluid intake, and medicines, and arrange a GP consultation if episodes repeat or cause falls.

Get emergency help if fainting occurs with chest pain, severe breathlessness, a sustained irregular heartbeat, confusion, seizure, serious injury, or new weakness or speech difficulty. Seek prompt advice for repeated fainting, worsening symptoms, black stools, heavy bleeding, or inability to keep fluids down. A first episode or a new change after starting medicine should be assessed.

Ask whether your medicines, hydration, heart rhythm, blood count, or other conditions could be contributing. Ask how to measure pulse and blood pressure safely at home and what reading or symptom should prompt urgent contact.