The symptoms of dizziness and nausea when lying down are considered to be caused by the following problems: 1. If episodic dizziness occurs during lying down with nausea, it is considered to be caused by benign paroxysmal positional vertigo, also known as otolithosis, because the otolith particles within the balance receptors are dislodged, and the dislodged otoliths will stimulate the semicircular canal cell membrane when the position of the patient’s head changes, leading to dizziness and nausea; 2. Cervical spondylosis, when When the vertebral artery is compressed patients will experience cervical vertigo with neck discomfort, such as with stiffness and pain in the back of the neck. Patients are advised to visit the clinic for positional testing and cervical spine CT to clarify the cause and develop a treatment plan for the cause.