Sudden nausea, dizziness and vomiting may be related to psychosomatic factors, or it may be caused by elevated blood pressure, acute cerebrovascular disease and other reasons. 1. Spiritual and psychological factors: due to mental tension, excessive pressure leads to depression and anxiety, which may lead to sudden nausea, dizziness and vomiting. 2. Elevated blood pressure: when the body’s blood pressure fluctuation increases, resulting in increased cerebrovascular pressure, cerebral blood flow hyperperfusion state, capillary permeability increases, it may cause sudden dizziness, nausea, want to vomit. 3. Acute cerebrovascular disease: common in transient ischemic attack, cerebral hemorrhage, cerebral infarction and other diseases, such as cerebral infarction, when the acute attack of cerebral infarction, due to the local cerebral tissues ischemia, hypoxia, resulting in the local cerebral nerves can not get enough blood and oxygen supply, resulting in damage to the cerebral nerves, it may be sudden nausea, dizziness, want to vomit, but also can be accompanied by slurred speech, swallowing disorders and other symptoms. Sudden nausea, dizziness and vomiting may be caused by other reasons. If the symptoms do not get better, you should consult a doctor as soon as possible to confirm the diagnosis and treatment under the guidance of the doctor.