Difference between orthostatic hypotension and POTS

Orthostatic hypotension happens when blood pressure falls after moving from lying or sitting to standing. Reduced blood flow to the brain can cause light-headedness, blurred vision, weakness, or fainting. It may follow dehydration, illness, blood loss, or medicines that lower blood pressure. POTS, or postural orthostatic tachycardia syndrome, is a problem with the body's response to upright posture: the heart rate rises markedly and symptoms may include dizziness, palpitations, fatigue, shakiness, and difficulty concentrating. Blood pressure may remain stable, fall slightly, or vary, but a defining feature is not the same as orthostatic hypotension. Both conditions can coexist with other problems, so symptoms need measured assessment.

Rise gradually, pause at the edge of the bed, and sit or lie down when symptoms begin. Avoid standing still for long periods and note meals, heat, illness, fluid intake, medicines, pulse, and symptoms. Do not increase salt, fluids, or compression treatment without individual advice, particularly if you have heart or kidney disease. A GP consultation can review medicines and arrange lying and standing measurements or other tests.

Seek urgent care for fainting with chest pain, severe breathlessness, a sustained irregular heartbeat, serious injury, new neurological symptoms, or confusion. Get prompt medical advice if symptoms are rapidly worsening, you cannot keep fluids down, or you repeatedly nearly faint.

Ask whether your symptoms suggest a blood-pressure problem, a heart-rate response problem, medicine effects, or another cause. Discuss what measurements are needed, whether a heart rhythm check is appropriate, and which activity, hydration, or compression measures are safe for you.