One of the clearest differences between Traditional Chinese Medicine (TCM) and conventional Western medicine lies in how each approaches diagnosis. Where Western medicine generally works toward identifying a single named condition, TCM diagnosis works toward identifying a "pattern" — a broader picture of imbalance that may manifest differently in different patients, even when their symptoms look similar on the surface. Sherman Lai, who practised TCM and acupuncture in Guelph, Ontario, for 37 years, built his clinical approach around this diagnostic framework, often describing it as treating the root rather than the branch.
Treating the root, not the branch
The idea of treating "the root, not just the branch" is a long-standing principle in TCM: a symptom is treated not in isolation, but as an expression of a deeper pattern of imbalance. A headache, for example, might stem from several different underlying patterns depending on the patient — and under TCM theory, each would call for a different treatment approach, even though the presenting symptom is the same. This is part of what distinguishes pattern-based diagnosis from symptom-based treatment, and it's a principle Lai applied throughout his career at the Centre of Integrative Natural Medicine in Guelph. More on his practice history is available in Who Is Sherman Lai?
The diagnostic tools of TCM
Traditional TCM diagnosis draws on four main methods: observation (including of the tongue, which is believed to reflect the state of internal organs), listening and smelling, inquiry (a detailed patient history), and palpation — most notably pulse diagnosis, which assesses qualities like rhythm, strength, and depth at different points on the wrist. Together, these methods build a picture of a patient's overall pattern rather than isolating a single measurable marker, which is part of why TCM diagnosis can look unfamiliar to those used to a conventional medical workup. A broader introduction to these concepts is in What Is Traditional Chinese Medicine?
Integrating pattern diagnosis with Western science
Lai's practice combined this traditional diagnostic framework with Western science, nutritional science, and lifestyle coaching, rather than treating TCM as a replacement for conventional medical care. He frequently cited peer-reviewed research — including University of Toronto studies on acupuncture's physiological effects — in explaining how TCM concepts like blocked Qi correspond to mechanisms better understood in Western terms, such as inflammation or impaired circulation. A full account of the research he presented over his career is on the Research & Practice page.
Why this approach mattered to his practice
For Lai, the value of pattern-based diagnosis was that it treated each patient's presentation as distinct, even when two people arrived with the same complaint. This philosophy shaped both his individual patient consultations and the broader integrative model that made the Centre of Integrative Natural Medicine, at its peak, one of the more established alternative medicine clinics in the region — a history covered in more detail in Traditional Chinese Medicine in Guelph: A Local History.