Vertically 0.5–1 cun.
Caution: Needling this point may be painful. Provide a competitive stimulus by pressing the palm with the fingernail close to the point before inserting the needle. Ask the patient to breathe out during needle insertion.
However, it is a much stronger point and is particularly used in Excess cases of the Heart such as excessive Fire or Heat regardless being Empty or Full Heat. There might be Phlegm on top of the Fire or Heat. The typical symptoms are insomnia with restless dreams, thirst, bitter taste, mental restlessness or hypomania, dark urine, tongue ulcers, and a red tongue with redder tip and yellow coating.
The Heart Channel connects to the Small Intestine Channel, which then is related to the Bladder Channel through the Greater Yang. Therefor, Shaofu HE-8 can influence the Bladder function and treat enuresis or urination difficulties. It can also clear Fire from the Kidneys, so as to treat genitalia skin itchiness.