Why do I feel dizzy when standing up suddenly after squatting for a long time?

Generally, dizziness upon suddenly standing up after prolonged squatting may be caused by orthostatic hypotension, insufficient blood supply from the internal carotid artery, or inadequate basilar artery perfusion.

1. Orthostatic Hypotension: Remaining in a squatting position for an extended period and then abruptly standing can reduce cerebral blood perfusion, leading to transient cerebral ischemia and a temporary drop in blood pressure. This type of transient hypotension usually resolves on its own, so there is no need for excessive concern. It is recommended that when rising after prolonged squatting, one should do so slowly to prevent episodes of transient hypotension.

2. Internal Carotid Artery Insufficiency: Conditions such as arteritis or arterial stenosis can impair blood flow through the internal carotid artery, resulting in dizziness when suddenly standing after prolonged squatting. It is advised to follow medical instructions for regular follow-up examinations and take medications such as flunarizine hydrochloride tablets or gastrodin tablets to improve cerebral blood supply.

3. Vertebrobasilar Artery Insufficiency: Diseases such as cervical spondylosis or hypertension can lead to insufficient blood supply in the vertebrobasilar arteries, causing dizziness upon sudden standing after squatting. Patients are advised to follow their doctor's recommendations and use medications such as enteric-coated aspirin tablets or flunarizine hydrochloride capsules for treatment.