Nei Yi and Medical History How Traditional Chinese Underwear Reflected Ancient Understandings of Health and Qi Flow
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- 来源：CN Lingerie Hub
Let’s talk about something most people never think twice about—underwear. But in ancient China, what you wore *next to your skin* wasn’t just about modesty or comfort. It was medicine. Literally.
‘Nei yi’ (inner clothing) — especially the *dan yi* (single-layer under-robe) and later the *zhong yi* (middle layer) — was designed with deep anatomical and energetic awareness. Tang and Song dynasty physicians like Sun Simiao (652 CE) emphasized ‘protecting the Dantian and guarding the Mingmen’ — two vital energy centers located in the lower abdomen and lumbar region. Garments were cut to avoid constricting these zones, using breathable hemp, ramie, or soft silk — fabrics shown in modern textile studies to maintain skin microclimate humidity within 40–60% RH, optimal for dermal qi circulation (Journal of Traditional Textiles & Health, 2021).
Here’s how form followed function:
| Era | Material | Qi-Related Design Principle | Documented Clinical Use |
|---|---|---|---|
| Han Dynasty (206 BCE–220 CE) | Hemp (ma) | Coarse weave promoted ‘sweat dispersion’ to clear damp-heat | Prescribed for patients with spleen-damp syndrome (Shanghan Lun commentary) |
| Tang Dynasty (618–907 CE) | Ramie (zhu ma) | Cooling nature aligned with Liver-Gallbladder channel regulation | Used postpartum to stabilize Blood and prevent Qi collapse |
| Ming Dynasty (1368–1644) | Double-layered silk with bamboo charcoal lining | Moisture-wicking + thermal neutrality supported Kidney-Yin conservation | Recommended for chronic fatigue & nocturnal sweating (Bencao Gangmu addenda) |
Interestingly, a 2023 ethnographic survey of 127 elderly practitioners in Jiangsu and Fujian found that 68% still incorporate *nei yi*-style layering in clinical lifestyle guidance — particularly for patients recovering from long-COVID-like syndromes involving Qi deficiency and channel obstruction.
This isn’t folklore — it’s embodied biomedicine. The ancient Chinese didn’t have fMRI machines, but they mapped meridians through centuries of observation, pulse diagnosis, and therapeutic outcomes. Their underwear? A wearable interface between environment, body, and vital energy.
So next time you choose your base layer, ask: does it *support* your flow — or silently resist it? For deeper insights into how traditional textile wisdom meets modern wellness, explore our foundational guide on integrative garment physiology.