Dizziness is a physiological or pathological sensation that people often experience in their lives. It often manifests as a feeling of dizziness, head swelling, light-headedness, shaking in the brain, and blurred vision. It is not an independent disease per se, but only a subjective feeling of the patient. The following are the common causes of dizziness: 1. Otogenic dizziness: including external ear diseases such as cerumen compression and foreign body obstruction; middle ear pathologies such as otitis media, tympanic membrane entrapment and Eustachian tube obstruction; inner ear pathologies such as labyrinthitis, motion sickness, labyrinth trauma and inner ear vascular disease. 2, neurogenic dizziness: including speech disorders such as brainstem, cerebellum, meningitis, etc.; vascular diseases such as cerebral hemorrhage, insufficient blood supply to the vertebral basilar artery, posterior inferior cerebellar artery thrombosis, etc.; trauma such as cranial trauma, brainstem, cerebellar injury, rock fracture, etc.; tumors such as cerebellar brainstem tumors, pontocerebellar cerebellar horn tumors, etc.; other lesions such as high and low cranial pressure, multiple sclerosis, medullary cavity, etc. 3, ophthalmogenic dizziness: often aggravated by opening the eyes and reduced or disappeared by closing the eyes. Mostly ophthalmic myopathy, refractive error, glaucoma or visual impairment, etc. 4, systemic diseases: generally no sense of visual rotation, often dizzy or unstable standing. Common causes, cardiovascular diseases such as hypertension, hypotension, heart disease, arrhythmia, vasculitis and carotid sinus syndrome; endocrine and metabolic diseases such as hyperglycemia, hypoglycemia, hyperthyroidism, pheochromocytoma, etc.; systemic infections and toxic diseases such as fever, carbon monoxide poisoning, etc.; blood diseases such as anemia erythrocytosis, etc.; 5, vascular inhibitory dizziness: often due to emotional stress, pain, fear, bleeding, It is often triggered by emotional stress, pain, fear, bleeding, sultry weather, fatigue, cavitation, insomnia, etc. Patients often have dizziness, vertigo, nausea, epigastric discomfort, pallor, cold sweats and other plant nervous disorders. Their blood pressure drops and pulse is weak. Vasodepressive dizziness is most often seen in young women who are frail. Orthostatic hypotension refers to dizziness, blurred vision, leg weakness, vertigo, and even syncope when standing, often accompanied by an absence of sweating and urinary and fecal disturbances.