Lightheadedness and dizziness may be caused by high blood pressure, hypoglycemia, anemia, and so on. 1. High blood pressure: When blood pressure is too high, it will dilate the blood vessels in the brain and cause dizziness and other symptoms. 2. Hypoglycemia: When blood sugar is too low, the body and brain supply is insufficient, and the symptoms of lightheadedness and dizziness will occur easily. 3. Anemia: Anemia is a condition in which the content of red blood cells and hemoglobin in peripheral cells is low, and the effective circulating blood volume is insufficient, which can induce the symptoms of light-headedness and dizziness. It is recommended that people with dizziness go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.