Momentary vertigo is a sudden feeling of dizziness and lightheadedness, looking at things will feel like they are all spinning, and then quickly return to normal after a few seconds. There are several reasons for this symptom: 1. The most common cause is insufficient blood supply to the cerebral arteries, and the transient cerebral ischemic attack, often caused by excessive fatigue or mental stress, resulting in increased blood pressure and cerebral vascular spasm. 2. Getting up too fast or walking too fast, failing to have 3. Anemia and hypoglycemia can also cause a lack of energy in brain tissue, resulting in vertigo due to the inability of the brain to move normally. 4. Otoliths can also cause momentary vertigo, where the otolith touches the wall of the semicircular canal during head position changes, causing transient episodes of dizziness that last for several seconds. The symptoms last for several seconds and recur with changes in head position and body position. There are many causes of momentary vertigo, usually the above, and should be prevented and treated according to the different causes.