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(Attached to the chest and hypochondrium)
The clavicle, known in meridians as the Zhu Gu (Pillar Bone), lies horizontally outside the Quepen (LI15) on both anterior shoulders. Its two ends connect externally to the shoulder joints. If fractured due to a blow causing displacement or falling, first use manual manipulation to press the sternum, bring the shoulder ends inward to align, massage the fracture to reduce it, suspend the shoulder with a strap around the neck to prevent movement, administer Jiegu Zijin Dan (Bone-Setting Purple Gold Pill), apply external Dingtong San (Pain-Calming Powder), and paste Wanling Gao (Ten Thousand Spirits Plaster); recovery is possible.

The sternum, also called Ying Gu (Chest Bone) or Yi Gu (Breastbone), is commonly known as the chest. The area from the axillae to the end of the ribs is termed the hypochondrium (Xie). The small ribs below the hypochondrium are called the costal margin (Ji Xie), commonly known as soft ribs. Collectively, the hypochondrium and ribs are referred to as the "hypochondriac region" (Xie Lei). The Qigu (Divided Bone) refers to the junction of the ends of the Fu Gu (Sternum/Manubrium), located below which is the Jiwei bone (Xiphoid process). The Bixin bone is also the Jiwei bone. It consists of cartilaginous tissue located between the lower Qigu bones. For the Fu Gu, bind with cloth for several turns, take Jiegu Zijin Dan, apply Dingtong San with heat compression externally, and paste Wanling Gao. If there is internal blood stasis causing swelling and pain, with difficulty bending forward or extending backward, take Zijin Dan. If constipation is present, purge with Canhuang San. If the injury is old, with the sternum protruding, muscle wasting, internal pathogenic heat and blood stasis, epigastric fullness and distension, blueish discoloration of the eyes, fatigue, phlegm, wheezing, and cough, take Zijin Dan. If the injury is severe, affecting the Qi of the Heart and Lungs internally, leading to coma with closed eyes, vomiting blood and water, hiccups, and tremors, the condition is critical and untreatable.

The transverse bone above the heart pit, also called the Renzi bone (Human Character Bone), when injured: injury to the first segment leads to death in one year; the second segment in two years; the third segment in three years. This area corresponds internally to the Lung; injury inevitably causes hemoptysis and cough. Severe injuries to the front or back of the chest, if prolonged, can transform into Phlegm-Fire consumption (Tan Huo Lao Qie). Injury to the left breast induces cough; injury to the right breast induces hiccups. For all chest and hypochondriac injuries, Lidong Wan (Li Dong Pill) and Sanhuang Bao La Wan (Three Yellows Precious Wax Pill) may be used酌情ly, followed by formulas that regulate the Lung to conclude treatment.

The back (Bei) is the general term for the area from the Dazhui (GV14) below to the waist above. It is also called the spine (Ji Gu) or Lv Gu (Back Muscle Bone), commonly known as the backbone. Its shape is linear; anteriorly it corresponds to the chest and hypochondrium. The lumbar vertebrae refer to the 14th, 15th, and 16th vertebrae of the spine. The coccyx (Wei Lu Gu), also called Kao Gu, is wide at the top and narrow at the bottom, supporting the lumbar and spinal bones above. There are four holes on each side, known as the Ba Liao (Eight Holes). The terminal segment is called Wei Lu, also known as Di Duan, Jue Gu, Qiong Gu, or commonly as Weichun. If injured by falls or blows, with blood stasis aggregation and condensation, and raised spinal tendons, first soften the tendons to make them pliable. Internally take Zijin Dan, apply Dingtong San, cauterize with a red-hot iron tool, and paste Hunyuan Gao. If vertebral dislocation occurs, preventing flexion and extension, with unbearable pain and stiff lumbar tendons, have the patient grasp ropes with both hands and stand on bricks with feet. Place three bricks under each foot, secure them, hold the lower back, remove one brick from each foot, straighten the patient's body, remove another brick, repeat this three times until feet touch the ground. This allows Qi to circulate and stasis to dissipate, raising depressed areas and straightening curved ones. Then wrap and tightly bind the lumbar column to avoid obstruction. The patient should only lie supine, not laterally. Once the Lv Gu is aligned, the ailment ceases; administer Jiegu Zijin Dan. This method is also used for depressed chests. If the Qi Gate is injured, Qi becomes blocked, leading to lockjaw, opisthotonos, and rigidity resembling death; death occurs within three hours if Qi exits through the anus. In such cases, do not panic. Check for respiration. If absent, it indicates injury from an upward-thrusting fist. Have the patient sit cross-legged, pull their hair to rest their head on your knee, strike their back to expel Qi through the mouth for revival, then administer Lidong Wan. For swelling and congestion of the Wei Lu (coccyx) caused by squatting impacts, which affects the waist and hips, take Lidong Wan, then Jiegu Zijin Dan, and paste Wanling Gao. If the Haidi acupoint is kicked, blood rushes upward, causing loud ringing in the ears and fainting. First take Huxin Wan (Heart-Protection Pill), then Zijin Dan.