Cough, asthma, chest and rib pain, mastitis.

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

Step 1: Sit upright or lie supine.
Step 2: Starting from the nipple, follow the midline of the breast (the vertical line through the nipple) upwards through one intercostal space (i.e., the third intercostal space), and press where there is a sensation of soreness and swelling, which is the location of the acupoint.