Fei Xin, also called Lung Heart, is a 2-point unit on the G-line of the middle finger (3rd metacarpal) on the middle phalanx. The G-line runs down the centerline of the dorsal aspect of the finger. These two points are located at the 1/3 and 2/3 marks if you divide this phalanx into thirds.
![](https://static.wixstatic.com/media/366cc7_e84329bf0bc94b86a1c12c2ac6dd289d~mv2.png/v1/fill/w_66,h_83,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/366cc7_e84329bf0bc94b86a1c12c2ac6dd289d~mv2.png)