Insert obliquely in a proximal direction or vertically by 0.2-0.3 cun.
Like any Well-Jing points, Shangyang LI-1 is useful in clearing Heat and removing Obstructions in Excess patterns. It is most effective in reducing swelling and ease pain caused by Wind-Heat accumulation.
It can clear both Interior and Exterior Heat. The typical symptoms are toothache, tinnitus, deafness and lower cheek pain. When Exterior Wind-Heat invades, it first attacks the Lungs' Defensive Qi and cause sore throat and painful obstruction of the throat. The Exterior Wind-Heat may also invade eyes and cause acute conjunctivitis.
Together with other Well-Jing points, it is particularly effective in subdue Interior Wind so as to restore consciousness. In the acute cases, such as Wind-stroke, it is recommended to prick to bleed with needle, lancet or three-edged needle.
Actually for all the Channels that originates at the fingertip or toes, this principle applies. Their first point (Well-Jing) receive Qi and impact from the related Channels which terminate at the finger or toes.
For example, for all the Channels of the Hand (Yang starts while Yin ends):
For all the Channels of the Foot (Yin starts while Yang ends):