Confusion, nausea and dizziness may be related to severe lack of sleep, or it may be caused by high blood pressure and iron deficiency anemia. 1. Severe lack of sleep: due to recent mental stress and excessive psychological burden, resulting in poor sleep quality and serious lack of sleep. Over time, it is easy to cause cerebral nerve dysfunction, then it may show the symptoms of confusion, nausea, dizziness, and may also be accompanied by mental lethargy, weakness and other symptoms. 2. Hypertension: When the blood pressure fluctuates and rises, especially when the fluctuation is large, the pressure in the cerebral blood vessels increases significantly, which may cause confusion, nausea and dizziness, and may also be accompanied by headache, or even vomiting and other symptoms. 3. anemia: due to insufficient blood volume in the patient’s body, the number of red blood cells in the blood is reduced, the ability of the blood to carry oxygen is insufficient, resulting in a chronic lack of oxygen in the brain, which may cause confusion, nausea, dizziness, and may be accompanied by symptoms such as pallor and general weakness. Confusion, nausea and dizziness may also be caused by other reasons, if the symptoms recur frequently, or there are other obvious discomfort, you should consult a doctor as soon as possible to diagnose the cause and then give targeted treatment.