Pain felt to come from the bone. It is observed in impediment (bì) patterns, bone fractures, and vacuity taxation. Incisive Light on the Source of Miscellaneous Disease (杂病源流犀烛 zá bìng yuán liú xī zhú) states, Pain in the human body may be caused by wind spreading and dampness stagnating, or by blood pricking and phlegm attacking. When shallow, it is no deeper than the skin and body hair; when deep, it penetrates as far as the channels and network vessels. If it enters the interior and stretches into the bone, causing aching and pain, although it differs depending on whether the cause is cold or heat... It is treated with Tiger Bone Powder (虎骨散hǔ gǔ sǎn) or Mysterious Three Powder (三妙散sān miào sǎn). If prolonged standing has damaged the bone, or if there is bone damage, causing pain or gradually giving rise to wilting, this urgently requires treatment at onset, using psoralea (Psoraleae Fructus, 补骨脂bǔ gǔ zhī), beef marrow (Medulla Bovis, 牛骨髓niú gǔ suǐ), velvet deerhorn (Cervi Cornu Pantotrichum, 鹿茸lù róng), and drynaria (Drynariae Rhizoma, 骨碎补gǔ suì bǔ). Compare aching bones.