Essence and blood, both in the category of yin, are often mentioned together. Both come from food taken in by the spleen and stomach. They are bound together for good or ill. Since the liver stores blood and the kidney stores essence, diseases resulting from a deficiency of essence and blood are treated by nourishing the liver and kidney.

1. When evil wind invades the human body,  it becomes hot.
3. When essence and blood are harmed, they are no longer able to nourish the liver.
2. Evil qi has harmed the liver, and essence and blood were affected.
4. If you eat too much, the tendons of the stomach and intestines will be harmed because of the packed food.
5. You will suffer from diarrhea and hemorthoids.
6. If you drink too much, the qi will go rise.
7. If you overexert yourself. . . .
8. The kidney qi will be harmed and your waist will ache.
Also learn more in the article Acupuncture for habitual constipation.