What causes a sudden dizziness lasting for a few seconds?
Sep 13, 2023
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
In general, sudden dizziness lasting a few seconds may be caused by anemia, orthostatic hypotension, hypoglycemia, benign paroxysmal positional vertigo (BPPV), arrhythmia, or other reasons. In addition, it could also result from transient ischemic attack (TIA), cerebrovascular malformation, cerebral hemorrhage, and similar conditions. It is recommended to seek medical attention promptly for an accurate diagnosis and receive treatment under the guidance of a physician to avoid delaying the condition.
Sudden dizziness lasting several seconds is generally caused by conditions such as anemia, orthostatic hypotension, hypoglycemia, benign paroxysmal positional vertigo (BPPV), arrhythmia, and other reasons. A detailed analysis is as follows:
1. Anemia
Anemia reduces the number of red blood cells and hemoglobin in the body, leading to decreased oxygen content in the blood and cerebral hypoxia, which may result in sudden dizziness. If anemia is severe, with hemoglobin levels below 60 g/L, red blood cell transfusion may be administered under medical supervision. If anemia is due to deficiencies in iron or vitamin B12, patients are advised to take medications such as iron dextran dispersible tablets or vitamin B12 tablets as directed by a physician.
2. Orthostatic Hypotension
Sudden dizziness upon standing quickly after squatting may be due to orthostatic hypotension, which results from transient cerebral ischemia. Diagnosis can be confirmed through supine and upright blood pressure measurements. Usually, no specific medication is required; it is sufficient to change body positions slowly.
3. Hypoglycemia
Low blood glucose levels lead to insufficient energy supply for the body, causing dizziness, often accompanied by fatigue and other discomforts. Symptoms can typically be relieved by oral intake of sugar cubes or sweets. Alternatively, intravenous administration of glucose injection or glucose-sodium chloride injection may be performed under medical guidance.
4. Benign Paroxysmal Positional Vertigo (BPPV)
The exact cause of BPPV is not fully understood, but when otolith particles in the utricle and saccule become dislodged, changes in head position can stimulate the semicircular canal membranes, resulting in episodic dizziness with visual rotation. Severe cases may even cause nausea and vomiting. Treatment usually involves manual repositioning maneuvers under medical supervision, along with medications such as betahistine mesylate tablets or difenidol hydrochloride tablets as prescribed, which can help alleviate dizziness.
5. Arrhythmia
Arrhythmia impairs conduction tissues such as the atrioventricular bundle, leading to bradycardia or tachycardia, thereby affecting cerebral blood flow and causing sudden episodes of dizziness. Patients are advised to take medications such as procainamide hydrochloride tablets or diltiazem hydrochloride sustained-release tablets as prescribed.
In addition, sudden dizziness could also be caused by transient ischemic attack, cerebrovascular malformations, cerebral hemorrhage, or other conditions. It is recommended to seek timely medical evaluation for accurate diagnosis and treatment under professional guidance to avoid delays in managing the condition.
