After eating seafood dizziness, nausea is mainly seen in the following aspects: First, acute gastroenteritis, in addition to dizziness, nausea, can also be accompanied by abdominal pain, diarrhea, vomiting, fever, body weakness, some patients will appear dry mouth and tongue and other dehydrating phenomena, gastroenteritis can be a serious hydroelectrolyte disorders, it is recommended to go to the hospital gastroenterology department to seek medical treatment after the above situation. Second, cervical spondylosis, often have a history of cervical spondylosis, mostly seen in heavy manual labor or long time working patients, due to the long time in the meal head down induced dizziness, the patient is also accompanied by discomfort in the back of the neck, shoulder pain, headache, numbness of the upper limbs and other symptoms, cervical spine magnetic resonance imaging examination can be further clarified the diagnosis. Third, posterior circulation ischemia, mostly seen in middle-aged and elderly patients, the common cause is atherosclerosis, dizziness is transient, in addition to dizziness, often accompanied by a transient tilting of the mouth and eyes, dysphagia, slurred speech, numbness of the limbs, etc., and it is recommended to go to the hospital Neurology Department for consultation.