Points ST-36 (Leg Three Lǐ, 足三里 zú sān lǐ), BL-40 (Bend Center, 委中 wěi zhōng), LU-7 (Broken Sequence, 列缺 liè quē), and LI-4 (Union Valley, 合谷 hé gǔ), which command the body and are used to treat ailments that affect those particular sections. ST-36 is the command point of the abdomen, and treats diarrhea, constipation and abdominal pain and distension. BL-40 is the command point of the back and lumbus, and treats pain in those parts. LI-4 is the command point of the face and mouth and is useful for treating such diseases as toothache, swollen cheeks, nosebleed and headache. LU-7 is the command point of the head and nape, and treats headache and stiffness of the nape. Command points are often combined with points more specific to the disease being treated. For example, treatment of lumbar pain might pair BL-40, the command point of the back, with local points such as BL-23 and BL-30.