Dizziness, nausea need to be alert to diseases including neurological diseases, cardiovascular and cerebrovascular diseases, etc., may also be caused by physiological reasons. 1. Neurological diseases: for example, vestibular neuronitis, various kinds of encephalitis, meningitis, brain abscess and so on can lead to dizziness, nausea and other symptoms. 2. Cardiovascular and cerebrovascular diseases: for example, myocardial infarction, cerebral infarction, cerebral hemorrhage and other diseases can cause nausea and dizziness. Myocardial infarction is often accompanied by obvious chest tightness and chest pain. Cerebral infarction and cerebral hemorrhage are often accompanied by symptoms such as impaired limb movement, unclear speech and even unconsciousness. 3. Physiological reasons: for example, when motion sickness, seasickness can appear dizziness, nausea and other symptoms, usually in the car, off the boat after the symptoms can be relieved. It is recommended that patients with dizziness and nausea should consult a doctor in time to find out the cause and standardize the treatment under the guidance of the doctor.