What causes a sudden dizziness in the back of the head?

A sudden dizziness in the back of the head may be caused by physiological factors, or it could result from pathological conditions such as cervical spondylosis or cerebrovascular diseases.

1. Physiological Causes

A sudden dizziness in the back of the head may occur when changes in neck and head posture lead to a temporary reduction in blood supply to the brain, or after sudden vigorous physical activity. This is usually a normal physiological phenomenon that resolves quickly on its own.

2. Cervical Spondylosis

Dizziness may also be due to cervical spondylosis, which commonly results from maintaining the same posture for prolonged periods or excessive fatigue leading to cervical bone spurs. These spurs can compress the vertebral-basilar arteries, significantly reducing cerebral blood flow. Patients may simultaneously experience symptoms such as neck stiffness, numbness in the limbs, vomiting, and nausea. In severe cases, blurred vision or difficulty breathing may occur.

3. Cerebrovascular Diseases

Cerebrovascular diseases can also cause such dizziness, including transient ischemic attack (TIA), cerebral infarction, and cerebral arteriosclerosis. These conditions typically lead to insufficient blood supply to the brain. Patients may also experience symptoms like headache, fatigue, and difficulty concentrating.