Pectoralis major
Body region：Chest and abdomen
Tight chest, inward-rotated shoulder, aching or numbness on the inner arm
Function
Originates from the clavicle, sternum and costal cartilages, and inserts at the crest of the greater tubercle of the humerus. Adducts and medially rotates the shoulder.
Common causes
Rounded shoulders from prolonged sitting, weight training that emphasizes pushing movements, and long periods of typing.
Massage and stretching
- Knead with the heel of the hand
- Doorway stretch
Related acupoints
- Danzhong (CV17)：Midline of the front of the chest, midpoint between the nipples
- Jianyu (LI15)：Depression below and in front of the acromion when the arm is raised horizontally
Related meridians
Lung Meridian of Hand-Taiyin、Stomach Meridian of Foot-Yangming
Posture and muscle patterns
When to see a doctor：Severe abdominal pain, blood in the stool, or chest pain with pressure: seek medical care immediately. Avoid abdominal acupoints during pregnancy.