Dizziness from a little exercise may be due to lack of oxygen to the brain. When the human body is exercising, blood will flow to the limbs and blood circulation is accelerated, which can easily cause temporary lack of oxygen to the brain and thus cause dizziness. If the body does not rest enough, the body is overly tired, in the exercise is also easy to cause brain hypoxia, the phenomenon of dizziness. Dizziness after a little exercise can also be considered as a result of anemia, when the body becomes anemic, the body’s hemoglobin content will be reduced. When the body becomes anemic, the hemoglobin content in the body decreases and the oxygen content in the body decreases. When the body exercises, the oxygen demand of the brain increases, but the brain does not get enough oxygen supply at this time, thus causing dizziness. Patients with hypothyroidism may also experience dizziness after a little exercise. When the body is hypothyroid, it leads to low metabolism, resulting in elevated blood lipids, increased viscosity, and slow blood flow, which can cause dizziness.