There are many diseases that cause severe dizziness: 1, anemia, mild anemia can cause dizziness, pallor and other symptoms, but moderate-to-severe anemia can cause severe dizziness, weakness, and if it is not treated in time, it may cause shock, etc.; 2, Meniere’s syndrome of unknown etiology can cause dizziness, aggravation of spinning sensation after the activity, which may be accompanied by nausea, vomiting and other symptoms. Severe patients can not move their head, but cranial examination is generally not a big problem; 3, cerebellar lesions, cerebellum is the body’s balance organ, if there is a cerebellar infarction, cerebellar hemorrhage and other diseases, can cause dizziness and other symptoms, can appear gait instability and other symptoms. In addition, otolithiasis, otitis media, cerebral infarction and other diseases can cause dizziness. When dizziness occurs, it is better to rest first to avoid falling, and it is recommended to go to the hospital in time for further examination to confirm the diagnosis, such as cranial CT.