A normal fasting blood glucose of 7.19 mmol/L may cause dizziness, and this value is already high, it is recommended to retest the fasting blood glucose value on a non-same day, to be diagnosed by a professional physician, and treated if necessary. The latest diagnosis of diabetes mellitus is based on the typical symptoms of “three more and one less” (excessive drinking, excessive urination, excessive eating, and weight loss) coupled with a venous plasma glucose measurement of ≥11.1mmol/L at any time of the day, a fasting glucose measurement of ≥7.0mmol/L, or a 2-hour post-glucose-tolerance test glucose measurement of ≥11.1mmol/L. Diabetes mellitus is diagnosed when one of these three items is met. Vertigo in normal people with fasting blood glucose 7.19mmol/L can be caused by a variety of reasons, such as hypertension, heart disease, etc. It is recommended to consult a medical professional for diagnosis and treatment to avoid delays.