Dizziness that occurs when the head is tilted backward may be caused by a variety of reasons. Commonly, cervical spondylosis, cerebrovascular disease, Ménière’s disease and blood pressure abnormalities can cause dizziness when the head is tilted back: 1. Cervical spondylosis: Patients with cervical spondylosis, due to degenerative lesions of the intervertebral joints stimulating or compressing the spinal cord and nerves, causing vascular damage, will aggravate the stimulation of blood vessels or nerves when the head is tilted back, affecting the blood supply and oxygen supply to the brain, thus producing dizziness; 2. Cerebrovascular disease. Usually caused by impaired blood supply to the brain, so ischemia and hypoxia can lead to ischemic necrosis or softening of restricted brain tissue, thus when the head is tilted back, excessive head movements can easily lead to dizziness; 3, Meniere’s disease: is an idiopathic membrane vagal effusion of the inner ear disease, manifested by recurrent episodes of rotational vertigo, fluctuating hearing loss, tinnitus, ear swelling and fullness, suffering from this disease may also be in dizziness when tilting the head; 4. Abnormal blood pressure: abnormal blood pressure is also prone to dizziness when the head posture changes. Dizziness caused by hypertension is due to high blood pressure, which increases the load on the heart, and in order to compensate, the contractile function of the heart is strengthened, which leads to increased cerebral blood perfusion and causes dizziness symptoms; low blood pressure makes the heart pumping capacity poorer, leading to dizziness from insufficient blood supply and oxygen supply to the brain.