Orthostatic Hypotension: This condition is common in the elderly due to age-related changes, medication side effects, or volume depletion, leading to a significant drop in blood pressure upon standing, which can cause dizziness or fainting.

Dehydration: Common in elderly patients, dehydration can lead to orthostatic hypotension and postural drops due to decreased blood volume.
Medication Side Effects: Many medications, especially antihypertensives, diuretics, and certain antidepressants, can cause orthostatic hypotension as a side effect.
Autonomic Dysfunction: Conditions like diabetes, Parkinson's disease, or multiple system atrophy can affect the autonomic nervous system, leading to orthostatic hypotension.

Cardiac Conditions: Such as Aortic Stenosis or Cardiac Tamponade, which can cause syncope or near-syncope with positional changes due to obstructed blood flow or impaired cardiac filling.
Severe Anemia: Can lead to reduced oxygen delivery to tissues, resulting in symptoms similar to orthostatic hypotension.
Pulmonary Embolism: Although less common, a pulmonary embolism can cause sudden onset of symptoms including syncope, especially with position changes.

Pheochromocytoma: A rare tumor of the adrenal gland that can cause episodic hypertension and orthostatic hypotension due to excessive catecholamine release.
Subclavian Steal Syndrome: A rare condition where there is a significant stenosis or occlusion of the subclavian artery, leading to reversal of blood flow in the vertebral artery, which can cause syncope or dizziness with arm exercise.
Malignant Vasovagal Syncope: Although vasovagal syncope is common, a malignant form with a high risk of injury or death due to recurrent episodes is rare but should be considered in the differential diagnosis of postural drops.