After a long bath time causes dizziness, there are several reasons: 1, the capillaries of the skin will expand when bathing, and heat-related, it will make many blood redistribution occurs, most into the skin and peripheral vasculature, making the total amount of blood into the brain tissue is reduced, there will be brain ischemia, hypoxia symptoms; 2, after a long bath time will have dehydration symptoms, the patient water loss caused by reduced blood volume, there will be hypotension, resulting in insufficient blood supply to the brain; 3, bathing for a long time will be due to a large consumption of energy to appear hypoglycemia, or a significant hunger. Because the brain’s energy supply is more dependent on the sugar in the blood, when there is hypoglycemia, dizziness will be the first symptom; 4, more water vapor in the bath room will lead to a decline in oxygen content, the patient will be washed for a long time after the symptoms of hypoxia, will also cause dizziness.