Heart pain, palpitations, vomiting blood, nosebleed, pain in the chest and ribs, pain in the elbow and arm, swelling in the armpit, carbuncles, epilepsy.

On the palmar side of the forearm, along the line connecting Marsh at the Crook (PC-3) and Great Mound (PC-7), 5 cun above the wrist transverse crease. (This acupoint is bilateral, one on each side.)

Step 1: Extend the arm with the palm facing up and slightly bend the wrist to make a fist;
Step 2: On the inner side of the arm, you can feel two distinct cord-like tendons (the palmaris longus tendon and the flexor carpi radialis tendon);
Step 3: Divide the distance from the wrist crease on the palm side to the elbow crease into two equal parts;
Step 4: Measure 1 horizontal finger width downward from the midpoint of the 1/2 division (the width of the interphalangeal joint of the thumb is considered 1 cun), and the depression between the two tendons is the location of this acupoint.