The vitality of the blood and the onset of disease have a close relationship, the vitality of the blood, the vitality is enough, although there is an external evil but not easy to disease; the vitality of the blood is weak, the vitality loss is intolerant of cold and heat, easy to disease. And sometimes people who are full of qi and blood are also prone to illness. For example, some good health people usually love anger and fire, his qi and blood exuberant, fire meets sufficient qi and blood is more likely to be stagnant, he is more likely to get some of the fire and heat for the sufferers of the actual disease, such as sores on the mouth and tongue, eye redness, swelling and pain, etc. So things are not absolute. So things are not absolute, and keep the body’s balance is the magic weapon not to get sick, more or less are not. As the ancient “yin and yang secret”, that is, the balance of yin and yang, in fact, this is the truth.