Insufficient blood supply can lead to dizziness. When the blood supply to the brain is insufficient, brain tissues and cells will be in the stage of ischemia and lack of oxygen, which will mainly manifest as dizziness and dullness. If an acute attack of cerebral blood supply deficiency occurs suddenly, the patient may experience severe dizziness, severe nausea, vomiting, and even inflexible limb movement. This type of cerebral ischemia and cerebral neurological deficits are mainly caused by cerebral atherosclerosis or high-fat, high-viscosity blood and slow cerebral blood flow. Some patients also have heart-related diseases, such as chronic cardiac insufficiency or atrial fibrillation, frequent premature ventricular contractions and other diseases that affect the pumping of blood to the heart, which may also manifest as dizziness due to insufficient blood supply to the brain.