Dizziness and dizziness with no energy may be related to severe sleep deprivation, or it may be caused by hypoglycemic reaction, iron deficiency anemia and other reasons. 1. Severe sleep deprivation: If the recent long-term mental stress, often excessive late night, resulting in significantly worse sleep quality, sleep time is seriously insufficient. If the brain can not get good rest for a long time, it is easy to induce brain dysfunction, which may cause dizziness, lack of energy, and may be accompanied by inattention, mental fatigue and other manifestations. 2. Hypoglycemic reaction: When hypoglycemic reaction occurs, the tissues and organs of the whole body can not get sufficient energy supply, which is likely to cause cerebral tissue ischemia and hypoxia, and may show dizziness, lack of strength, accompanied by panic, hand tremor and other symptoms. 3. Iron deficiency anemia: Because the number of red blood cells in the patient’s blood decreases significantly, the oxygen content of the blood decreases, resulting in cerebral ischemia and hypoxia, which may cause dizziness and lack of energy, and may be accompanied by pallor, poor appetite and other manifestations. Dizziness, dizziness and lack of energy may also be related to other factors, if the symptoms never get better, you should consult a doctor as soon as possible, after a clear diagnosis of the cause, to give targeted treatment.