If you do not get dizzy when you lie down and walk, you should consider the following possibilities: 1. Benign paroxysmal positional vertigo, which is the most common type of vestibular peripheral vertigo, caused by the dysfunction of the inner ear balance organ. When the patient changes position, dizziness is induced with visual rotation and sometimes nausea and vomiting, and the dizziness can be improved by changing position to the opposite side; 2. 3, postural hypotension, patients with autonomic nervous system disorders or dysfunction, resulting in patients from lying to sitting or standing position when the blood vessels can not contract in time, so that the blood flow back to the heart and then pump to the brain, causing a transient hypotension, will lead to a transient lack of blood supply to the brain, so that patients feel dizzy.