The most common cases of dizziness from hunger are the following four. First, hypoglycemic reaction, when the body’s blood sugar is lower than 2.9 mmol/L, a strong hypoglycemic reaction will occur. The most typical clinical symptoms of hypoglycemic reaction are dizziness, headache, cold sweat, severe hunger, panic, palpitations, accompanied by limb tremors, so the primary diagnosis of dizzy from hunger is hypoglycemic reaction. Secondly, the most common symptom of dizziness from hunger is also hyperthyroidism. When suffering from endocrine disease hyperthyroidism, there will be a significant increase in metabolism, easy hunger, dizziness when hungry and symptoms of transient blood supply deficiency. Third, starvation dizziness, the most common symptom is cerebrovascular ischemia, when dizziness after the rapid depletion of brain cells glycogen and lead to insufficient atp and glucose production and cerebrovascular insufficiency of blood supply. Fourth, starvation dizziness, the most common situation and brain cells lack of oxygen, in some diseases can trigger the brain cells oxygen supply capacity is insufficient, so that oxygenation is reduced, carbon dioxide binding rate increased, arterial blood oxygen saturation reduced will also appear due to starvation supply glucose function is insufficient, the brain lack of oxygen symptoms.