The ancient Chinese medicine concept of left liver, right lung, upper heart, and lower kidney originated from the visceral theory of ancient physicians. From the perspective of traditional Chinese medicine, the internal organs of the human body have corresponding relationships, which can reflect the physiological functions and pathological changes of the human body. Specifically, the term 'left liver and right lung' reflects traditional Chinese medicine's understanding of the position and function of the liver and lungs in the human body.
Traditional Chinese medicine believes that the liver is located on the left side of the human body, namely the left flank, and its main function is to release qi and regulate blood. The liver plays an important role in the human body, responsible for clearing toxins and waste from the body, maintaining qi and blood balance, and regulating emotions. When liver abnormalities occur, it directly affects the overall health of the human body. Therefore, in traditional Chinese medicine treatment, nourishing and protecting the liver is very important.
Corresponding to the liver is the lungs. The lungs are located on the right side of the human body, namely the right flank, and their main functions are to regulate qi and body fluids. The lungs are also very important for the human body, as they can remove phlegm and foreign objects from the respiratory tract and maintain smooth breathing. At the same time, the lungs are closely related to the body's immune function and can enhance the body's resistance. When abnormal lung function occurs, it can lead to the occurrence of respiratory system diseases.
古中医思维，左肝右肺，上心下肾，这一观念源于古代医家的内脏学说。根据中医的角度，人体的内在脏腑具有相应的对应关系，这种关系可以体现人体的生理功能及病理变化。具体来说，“左肝右肺”这一说法体现了中医对于肝和肺在人体中的位置和功能的认识。

中医认为，肝脏位于人体左侧，即左侧胁部，主要功能是疏泄气机和调节血液。肝脏在人体中扮演着重要的角色，负责清除人体内的毒素和废物，维持气血平衡，以及调节情志。当肝脏出现异常时，会直接影响到人体的整体健康状况。因此，在中医治疗中，养肝、护肝是十分重要的。

与肝脏相对应的，是肺脏。肺脏位于人体右侧，即右侧胁部，主要功能是主气机和调节津液。肺脏对于人体来说同样十分重要，它能够清除呼吸道内的痰液和异物，保持呼吸通畅。同时，肺脏还与人体免疫功能有着密切关系，能够增强人体抵抗力。当肺脏功能出现异常时，会导致呼吸系统疾病的发生。