0.5–0.8 cun obliquely or transversely, parallel to the intercostal space or with or against the channel pathway.
Tianxi SP-18 is not a major point of the Spleen Channel.
Its main function is to regulate Qi in the chest and lateral costal region, so as to release pain and distension there. It also descends the Rebellious Qi to stop shortness of breath, coughing, hiccup and rattling sound in the throat.
Another important function of Tianxi SP-18 is that it promotes lactation by removing breast lumps and clear the clogged milk ducts.