Passages from Nei Jing: The Function of the Five Shu Points

Regarding the function of the five Shu points, the Nei Jing is very clear and shows how the disease may effect the Zang-Fu organs and which points to use.  Chapter forty-four of Ling Shu states; 


“病在脏者，取之井；病变于色者， 取之荥；病时间时甚者；取之输；病变于音者，取之经；经满而血者，病在胃，及以饮食不节得病者，取之于合。。。是谓五变也。” 


“When the disease is in the Zang organ, choose the Jing-Well point; when the disease changes the complexion, or color of the patient, choose the Ying-Spring point; when the gets better and worse at different times, choose the Shu-Stream point; when the disease changes the tone of the patient, choose the Jing-River;  when the meridian is full with blood, or when the disease is in the stomach and cases of improper diet, choose the He-Sea point… These are called the five changes.”