中医
zhōng yīTraditional Chinese Medicine — a complete medical system developed over two millennia, based on the theory of qi, yin-yang, and the Five Elements, still practiced by billions.
中 zhōng (Chinese; middle) + 医 yī (medicine; doctor — the character shows a medical chest with instruments). 中医 = Chinese medicine, as opposed to 西医 xīyī (Western medicine). The distinction is used throughout Chinese healthcare: hospitals often have separate 中医科 and 西医科 departments; patients routinely consult both systems.
The theoretical foundation of 中医 rests on three interconnected concepts. 气 qì (vital energy) flows through the body's meridian system (经络 jīngluò) and maintains health when flowing freely; illness results from blockage, deficiency, or excess. 阴阳 yīnyáng — the dual nature of all phenomena — must be balanced within the body: excess yin (寒 hán, cold) or excess yang (热 rè, heat) produces characteristic patterns of illness. The 五行 wǔxíng (Five Elements — Wood, Fire, Earth, Metal, Water) map onto organ systems, seasons, tastes, emotions, and therapeutic interventions.
Unlike Western medicine's disease-centered model (identify the pathogen, target the pathogen), TCM is person-centered: the same symptom in two patients may receive different treatments if the underlying 证 zhèng (pattern of disharmony) differs. The goal is not to eliminate a disease but to restore the patient's system to harmonious balance.
闻 wén — listening and smelling (voice quality, breathing sounds, body odor)
问 wèn — inquiry (ten standard questions about symptoms, history, lifestyle)
切 qiē — palpation (pulse diagnosis — the most distinctive TCM diagnostic technique)
Pulse diagnosis (脉诊 màizhěn or 切脉 qiē mài) is the most distinctive and sophisticated diagnostic technique in TCM. A trained practitioner places three fingers on the radial artery at the wrist and reads 28 classical pulse qualities (脉象 màixiàng): the rate, depth, width, strength, and rhythm of the pulse in three positions on each wrist correspond to specific organ systems. A skilled practitioner can detect patterns of imbalance without the patient saying a word.
Tongue diagnosis (舌诊 shé zhěn) is equally central: the tongue's color (pale/red/purple), coating (thin/thick/white/yellow/greasy), shape (swollen/thin/cracked), and moisture reveal the state of qi, blood, yin, and yang in specific organ systems. 舌苔厚腻 (thick, greasy tongue coating) = dampness and phlegm accumulation. 舌红无苔 (red tongue without coating) = yin deficiency with heat.