Standing on dizziness lying down is fine, need to consider two possible diseases: first, upright hypotension, which is an autonomic nervous system lesion, blood pressure is normal in the recumbent position, but when up the blood flow to the lower body, will lead to inadequate blood supply to the brain, in normal people blood vessels can continue to contract to ensure adequate blood supply to the brain. However, in upright hypotension, the blood pressure remains at a low level after getting up, resulting in poor blood supply to the brain, which can easily produce dizziness, often due to transient whole brain ischemia with blackness in front of the eyes. Secondly, benign positional vertigo, which is a lesion of the vestibular organs, usually due to edema in the inner ear and cochlear membrane vagus, resulting in stimulation of the balance organ in the semicircular canal, and position change will induce vertigo, often accompanied by rotation of visual objects.