The Lung meridian usually refers to the Hand Taiyin Lung meridian, a TCM term for a meridian that travels through the upper extremities, belongs to the lungs, and is full of yin qi. It travels from the chest position to the end of the thumb, mainly on the inner front edge of the upper extremities, and is adjacent to the Hand Yangming Large Intestine meridian. The meridian begins in the middle jiao (upper abdomen) and travels downward to contact the large intestine with the qi of the meridian, then upward through the upper mouth of the stomach (i.e., the cardia) and through the diaphragm to the lung, and from the lung and its associated tissues and organs (including the trachea and throat) outward along the upper sternum to the lower armpit, then down the inner side of the upper arm past the elbow fossa, and then along the ulnar border of the radius on the inner side of the small arm to the The radial artery pulsates at the wrist, followed by the greater interphalangeal area of the palm, and along the edge of the greater interphalangeal area near the thumb to the end of the thumb. Its branches detach at the back of the wrist and travel on the index finger along the edge near the thumb to the end of the index finger. The Hand Taiyin Lung meridian and other meridians are generally used in clinical practice for acupuncture treatment of diseases related to the lungs, including cough, shortness of breath, wheezing, hemoptysis, chest tightness, chest swelling and pain, sore throat, etc., as well as other diseases in the areas where the meridians travel, such as shoulder and back pain, soreness or sympathetic coldness in the front edge of the upper arm and inner forearm, and fever in the palm.