Vertically 0.5–1.5 cun.
Caution: Popliteal nerve, artery and vein lie deep to this point.
Weizhong is an important point with various functions.
It clears Summer-Heat. Therefore it treats Heat stroke that causes vomiting, diarrhoea, fever, delirium, headache, irritability and red skin rashes during summer time.
It also clears Damp-Heat from the Bladder, so as to treat various unitary symptoms such as burning urination.
It also removes obstructions from the Channel, so that it is able to relax the sinews and benefit the lower back. In fact, it is one of the most important distal point for any types of lower back pain, but it is more recommended for acute and Excess patterns. Due to BL-40's nature of cooling Blood, it is not recommended to be used for weak patients with severe Deficiency or Coldness symptoms. In these type of back pain cases, Kunlun BL-60 is more suitable.
As for the location of the lower back pain, BL-40 is more recommended if the ache is either bilateral or unilateral instead of being on the spine. Other typical manifestations are sciatica, lower back stiffness and knee pain.