The causes of dizziness and wanting to vomit are mainly the following: First, serious diseases, such as infarction or hemorrhage in the cerebellar region due to cerebrovascular disease, and infarction in the brainstem region can cause patients to have dizziness and wanting to vomit, even with ataxia. Secondly, dizziness and vomiting may be caused by peripheral dizziness. Common diseases include vestibular neuronitis, Ménière’s disease, and benign paroxysmal positional vertigo. Third, dizziness and vomiting may be caused by systemic diseases, such as cardiogenic cerebral insufficiency, heart-related diseases, or certain toxic diseases, such as carbon monoxide poisoning. Fourth, dizziness may be caused by ophthalmogenic problems with nausea and vomiting, such as ocular muscle paralysis and refractive error. Fifth, consider the factors of drugs, such as the patient used streptomycin, penicillin, caused by the adverse reaction of these drugs.