Location

on the lower leg, in the depression formed below the bellies of the gastrocnemius muscle when the muscle is flexed, approximately 8 cun below Weizhong (B40) and Kunlun (B60).

note; from the Achilles Tendon, run a finger along the midline of the leg until it falls into the depression formed between the two origins of the gastocnemus muscle bellies.

Needling

perpendicular insertion 1.0 to 1.5 inch.
angular insertion up or down the channel

Moxa is OK

Actions

Relaxes sinews
Activates the channel and relieves pain
Benefits the calf and heel
Relieves hemorrhoids

Signs and Symptoms

low back pain, leg muscle spasm, hemorrhoids, constipation.

Commentary:

Chengshan is included in the grouping of the most vital acupuncture points known as "The Twelve Heavenly Star Points."

It is the distal point of choice for the treatment of all kinds of Hemorrhoids. In Acupuncture treatments, it is most common to treat a disorder with points in the region of the disorder called 'Local' points points and points at the other end of the involved channel(s), or points that have proven to be effective, away from the disharmony, called 'distal' points. The TCM axiom is expressed in the phrase "treat on both sides, above and below for all disharmonies."

Chengshan is also the local point of choice for pain and spasm of the calf muscle and the distal point of choice for pain in the heel.

Finally, Chengshan is often recommended for Lumbar pain.