You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Most common symptom of Orthostatic Hypotension is and explain in detail?
(B) Lightheadedness # Orthostatic hypotension: Reduction in systolic BP of at least 20 mmHg or diastolic BP of at least 10 mmHg within 3 min of standing or head-up tilt on a tilt table, is a manifestation of sympathetic vasoconstrictor (autonomic) failure.> Characteristic symptoms include light headedness, dizziness, & presyncope (near-faintness) occurring in response to sudden postural change.> Nonspecific Symptoms include generalized weakness, fatigue, cognitive slowing, leg buckling, or headache.> Visual blurring may occur, likely due to retinal or occipital lobe ischemia.> Coat-hanger headache: Neck pain, typically in the suboccipital, posterior cervical, and shoulder region, most likely due to neck muscle ischemia, may be the only symptom.> Orthostatic dyspnea (thought to reflect ventilation-perfusion mismatch due to inadequate perfusion of ventilated lung apices) or angina (attributed to impaired myocardial perfusion even with normal coronary arteries).> Symptoms may be exacerbated by exertion, prolonged standing, increased ambient temperature, or meals.> Syncope is usually preceded by warning symptoms, but may occur suddenly, suggesting the possibility of a seizure or cardiac cause.> Supine hypertension is common in patients with orthostatic hypotension due to autonomic failure, affecting over 50% of patients.