2indexing radical for characters about illness, injury, and disease; nicknamed 病字头 (bìng zì tóu) because it caps 病
Tips
usage
疒 is purely a radical — never written on its own. It tops almost every illness-related character: 病 (sick), 痛 (pain), 疼 (ache), 疯 (mad), 痒 (itch), 瘦 (thin), 疲 (tired), 症 (symptom). Seeing 疒 is a near-guarantee the word relates to the body going wrong.
history
Originally a pictograph of a person lying on a bed, with the bed shown standing on its end. Schemes like Heisig translate it as 'sickness'; in Chinese classrooms it is taught as the 病字头, the top of 病.
Radical
SicknessKangxi #104
Highly productive — one of the strongest semantic clues in the script. If a character is capped with 疒, you can bet on a body, illness, or injury meaning. Always sits on top wrapping the right side; never appears alone in modern writing.