If the patient feels weak, dizzy and vomiting, there are usually several reasons for this: 1, commonly due to ionic disorders, the above clinical symptoms and manifestations occur in hypokalemia and hyponatremia. 2, in the case of acute cerebrovascular insufficiency of blood supply, medically known as T.I.A. attack, the patient will suffer from cerebrovascular insufficiency of blood supply and oxygen supply, resulting in general weakness, dizziness and nausea, vomiting. Patients with acute gastroenteritis may also have reflex dizziness, headache, nausea, and vomiting, but abdominal pain and diarrhea are usually present. 4. the above clinical manifestations.