Cough, asthma, expectoration of purulent blood, chest and rib pain, mastitis, etc.

On the chest, at the second intercostal space, 4 cun from the anterior midline. (This acupoint is bilateral, one on each side.)

Step 1: Sit upright or lie in a supine position.
Step 2: Starting from the nipple, follow the midline of the breast (the vertical line through the nipple) and push upwards through two intercostal spaces (i.e., the second intercostal space), where pressing induces a sensation of soreness and swelling, which is the location of the acupoint.