Vertically approximately 0.3–0.5 cun.
An alternative and safer method: Lift the muscle and insert the needle approximately 1 cun anteriorly or posteriorly into the muscle belly.
Caution: Contraindicated during pregnancy! Pneumothorax.
One of Jianjing GB-21's main function is to open the Channel by removing the Obstruction. It treats Painful Obstruction Syndrome on the shoulders and neck by relaxing the sinews and relieving stiffness there.
The second function is to benefit the breasts and promotes lactation for postpartum nursing mothers.
It helps descending Qi, so that it treats various childbirth issues such as retention of placenta, postpartum haemorrhage or threatened miscarriage. Therefore, this point is forbidden to needle during pregnancy.