How does it work? Or what is the theory behind TCM?

TCM is based on a very strong theoretical foundation. The Chinese medical theory is all based on the concept of ‘Qi’. Qi can be generally translated as referring to Energy. For example, we receive Qi from the air we breath and Qi from the food we eat. Correspondingly, all organs and processes in the body need Qi in order to perform their functions in our bodies correctly. It is said that there are energetic pathways or networks in the body, which correspond to various organs in the body such as the Liver and Spleen, etc. Each organ network, or meridian as they are called, has corresponding tissues, emotions, and even seasons associated with it and therefore corresponding patterns of disharmony. These patterns of disharmony are what cause pain or a certain disease.