There are many reasons for dizziness lying down, which are divided into physiological and pathological reasons, and pathological reasons include ear, nose and throat diseases, cervical spondylosis and cardiovascular diseases. 1. Physiological: If the speed and amplitude of lying down is too large, it may cause dizziness because of the sudden change of body position, which is a normal physiological phenomenon, and can be recovered after a moment’s rest, without additional special treatment. 2. Pathological: If you suffer from otolithosis and other otorhinolaryngological diseases, it may affect the vestibular balance function leading to dizziness and other symptoms of lying down. Lying down dizziness may also indicate cervical spondylosis, autonomic dysfunction and other diseases; cardiovascular disease may also be one of the causes, such as hypertension, hypotension and posterior circulation ischemia and other diseases. Lying down dizziness can also be caused by other reasons, if you suspect that this symptom belongs to the pathology, it is recommended to go to the hospital in time for standardized professional diagnosis and treatment.