Sudden dizziness in the morning is mainly due to the following causes: 1. Benign positional vertigo or otoliths, which is a transient dizziness caused by a change in head and body position where the otolith touches the wall of the semicircular canal. 2. Postural hypotension, which occurs when the patient is old and frail and suffers from vegetative nerve dysfunction. 3. When waking up, the sympathetic nerves of the body are not able to adjust the vasoconstriction in time to supply blood to the brain, resulting in postural hypotension. 3, anemia. Low hemoglobin content in human blood can lead to lack of oxygen to the brain and dizziness in the morning. 4. Drug-related factors. Patients taking oral benzodiazepines and sedative drugs can cause morning dizziness. 5. Patients with hypothyroidism can also experience morning dizziness. 6. Insomnia, poor sleep quality, and insufficient rest for the body and brain can also cause symptoms of dizziness.