It is not good to take a bath after eating, usually about an hour after the meal and then take a bath, after eating a meal the gastrointestinal tract needs a lot of blood to help digestion and absorption, this time the heart to the other organs, to the brain blood supply will be reduced accordingly. This is why people who are deficient in qi and blood will be sleepy and tired after meals. If you take a shower or bathtub bath at this time, there will be an opening of the small blood vessels around the body, and when the small blood vessels of the skin are opened, all the blood will fill up to the small blood vessels of the skin, and the skin will turn red. At this time, with the addition of blood from the gastrointestinal tract, there is less blood left to supply to the head or other organs. There is a risk of fainting at this time of bathing, and many of the symptoms of dizziness or even fainting, panic, and chest tightness that often occur when people bathe or soak in a bathhouse after drinking or eating are due to this.