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Fengchi (GB 20) is a point of the Gallbladder Meridian of Foot-Shaoyang. It is commonly used in clinical practice. According to the literature of traditional Chinese medicine, Fengchi (GB 20) can be used to treat many diseases, especially for the disorders caused by pathogenic wind. The indications include common cold, headache, cervical spondylosis, trigeminal neuralgia, hypertension, apoplexy, neurasthenia, epilepsy, optic atrophy, tinnitus, myopia, and painful heel etc. The viewpoints of different schools varies on the needling angle and depth at Fengchi (GB 20). Perpendicularly puncturing 0.3-0.7cun deep is recorded in most of the ancient books. Puncturing to a depth of 1.2 cun is mentioned in Fundamentals of Acupuncture and Moxibustion (针灸资生经) and Compendium of Acupuncture and Moxibustion (针灸大成). Jiang Yijun, a modern famous acupuncturist, holds that the depth of needle insertion at Fengchi (GB 20) should be varied in different individuals and different diseases. In general, deep puncture should be adopted for the disease in deep location, shallow puncture for the disease in shallow area, and tapping with plum-blossom needle for the disease on the skin. These will be introduced below.
