Dizziness lying on the right side indicates that dizziness is related to position change and may be a kind of positional vertigo, the specific causes are as follows: 1. The more common causes are vestibular peripheral vertigo, such as benign paroxysmal positional vertigo, or otoliths; 2. 3. Intracranial lesions can also present similarly to positional vertigo, such as cerebellar thrombosis, tumor, inflammation, and brainstem thrombosis or inflammation; 4. Ventricular tumor can also present similarly to positional vertigo when the position changes. All of these need to be clarified by cranial CT or MRI.