About
The character 痧 (shā) refers to acute illnesses marked by small, sand-like skin eruptions, including heatstroke, cholera, and measles. It is a phono-semantic compound: the radical 疒 (chuáng) indicates sickness, while 沙 (shā, "sand") provides both the pronunciation and a visual descriptor of the rough, granular spots. In traditional Chinese medicine, its use expanded to sudden, heat-related syndromes, inspiring therapeutic practices like 刮痧 (guāshā), where skin is scraped to produce sand-like petechiae and release systemic heat.