SP1: YINBAI (Hidden White)
On the medial side of the big toe, about 0.1cun posterior to the corner of the nail.
This is a wood and cheng point and a root point of ‘Tai Yin" (the greater yin division of Spleen & Lung). This strike has a great affect upon the muscles and tendons as it is a control point for those. It is also a control point for the divergent meridians. Spleen damage will occur immediately with a great energy drainage. There is a downwards rushing feeling when struck, followed by nausea and loss of power caused by this point’s connection with the lungs by being the root point of tai yin. So it drains Qi from the lungs as well as the spleen. Often used to relax problems related to menstruation, this point also controls bleeding (in healing) in the gastrointestinal tract. As a result, a strike here using adverse Qi will cause any bleeding to be worse and to be harder to stop, especially bleeding from for instance a knife strike to the stomach area. So this point can also be used as an excellent set up point to a knife attack!
This is also one of those points that will when struck affect the communication between heaven and earth causing great confusion between mind and body. In healing it is also used as one of the major treatments for shock. When used as a dim-mak strike however, the reverse happens with the symptoms of shock becoming apparent easier, even when a light to moderate strike to the head, for instance, has been felt. So, again, this is an excellent set up point or a major strike. SP 1Â’s affect upon the mind causes an inability to sleep soundly. IN healing, it is used to give a restful sleep.
A word of warning! SP 1 should never be used either in a dim-mak way or even for healing in pregnancy as it will have a adverse affect upon the uterus. In healing, it should never be used on a patient who suffers from diabetes as it will have an affect upon the balance of insulin/sugar.