There are many reasons that can cause dizziness, lethargy and lack of energy if the patient is experiencing dizziness. First of all, if the patient is middle-aged or elderly, consider that the patient is suffering from insufficient blood supply to the brain, and advise the patient to go to the hospital to check the blood glucose, blood lipid and blood pressure. If the patient has insufficient blood supply to the brain, he/she can take oral medication to improve blood circulation in the brain. In addition, some patients are caused by vegetative nerve dysfunction, due to insomnia and dreams, the brain nerves do not get enough rest, which will lead to headache, drowsiness and lack of energy in the long term. In addition, it is also necessary to do a thyroid function test, some patients may have hypothyroidism, so there will be a low metabolic state, and similar symptoms of dizziness and mental lethargy.