Eight Deficiencies is a term specially used for human body parts, which only appears in Lingshu Xie Ke in Neijing. Eight deficiency ("eight" refers to the eight joints of the human body, that is, two elbows, two axils, two beards and two stomachs) is the place where the five internal organs hide evil spirits.

It means virtual depression and weakness. According to Neijing, these eight parts are closely related to the five internal organs, because they are penetrated by the qi of the five internal organs and distributed by the corresponding blood collaterals. It is also a place where the surface of the joint is curved and the qi and blood are relatively weak, which is easy to be invaded by foreign evils or the evil blood stays. Through its symptoms, such as contracture, inability to stretch, pain and so on. , you can examine the pathological changes of the five internal organs, that is, the so-called "eight deficiency treats the five internal organs" (classics and diseases). Specifically, elbow corresponds to heart and lung, armpit corresponds to liver, moustache corresponds to spleen, and popliteal fossa corresponds to kidney.

Names of body parts. Refers to the elbow, armpit, moustache and chest on both sides. "Spirit Pivot Evil Guest": "People have eight deficiency, … treat the five internal organs, … lung and heart evil, and qi stays in two elbows; Liver is evil, and its qi stays in two axils; Spleen is evil, and its qi stays in the second beard; Kidney is evil, and its qi stays in two pits.

These eight deficiencies are all the chambers of viscera, where the true qi passes, where the blood collaterals swim, and where the evil spirits hate blood, so they cannot stay for a long time; If you stay, you will hurt your muscles and joints, and you will not be able to flex or stretch, so you will be arrested. "