Most non-TCM herbs are used individually to target specific conditions, such as peppermint for nausea and lavender for stress relief, and one's body constitution and the root causes of symptoms are not always considered.  In contrast, TCM looks into each herb's composition of properties and how they would interact with different body constitutions. Moreover, TCM rarely uses single herbs -- they are usually used in combinations in order to achieve synergistic effects and establish balance in the body.