The reasons for dizziness after sweating are as follows: First, the expansion of blood vessels after sweating will cause capillaries to open up, when the microcirculation is in an open state, which will increase cerebral blood flow and lead to dizziness. Second, after the steam usually leads to a transient lack of oxygen in the brain, such as in a closed and unventilated environment, will lead to symptoms of dizziness. Third, the most common cause of dizziness after the steam is also a transient hypoglycemic reaction, in the sweat of the body in a state of negative nitrogen balance, the need to consume and decompose excess body heat, anaerobic glycolysis and gluconeogenesis state. At this time, too much glycogen is consumed and a hypoglycemic reaction occurs, when blood sugar is less than 3.9 mmol/L, a hypoglycemic coma will occur resulting in dizziness.