Dizziness in the head and wanting to vomit can be either peripheral vertigo or central vertigo. Common conditions that cause peripheral vertigo include Meniere’s syndrome and otolithiasis. Common diseases that cause central vertigo include cerebellar brainstem infarction, cerebellar brainstem hemorrhage, and posterior circulation transient ischemic attack. Most patients with Meniere’s syndrome have a history of recurrent episodes, most of which are associated with mental stress, onset of exertion, and most of which are persistent, lasting from a few days to a week or so. In otolithiasis, symptoms are usually episodic and last from a few seconds to 1-2 minutes. Symptoms may occur suddenly when the head is turned, and may be accompanied by deafness, tinnitus, and rotating vision, as well as a normal cranial CT scan. Patients with cerebellar brainstem hemorrhage or cerebellar brainstem infarction are usually diagnosed with persistent cranial CT or MRI. If posterior circulation transient ischemic attack is considered, the patient usually has episodic symptoms, the duration of most of them is 10-15 minutes, rarely more than one hour, and the dizziness can be accompanied by balance disorder and ataxia, and the craniocerebral CT or nuclear magnetic examination is normal.