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Radical 104 or radical sickness (疒部) meaning "sickness" is one of the 23 Kangxi radicals (214 radicals in total) composed of 5 strokes.

In the Kangxi Dictionary, there are 526 characters (out of 49,030) to be found under this radical.

疒 is also the 115th indexing component in the Table of Indexing Chinese Character Components predominantly adopted by Simplified Chinese dictionaries published in mainland China.

Evolution

Strokes	Characters
+0	疒
+2	疓疔疕疖^SC (=癤) 疗^SC (=療)
+3	疘 (=肛 -> 肉) 疙疚疛疜疝疞疟^SC (=瘧) 疠^SC (=癘)
+4	疡^SC (=瘍) 疢疣疤疥疦疧疨疩 (=瘁) 疪疫疬^SC (=癧) 疭^SC (=瘲) 疮^SC (=瘡) 疯^SC (=瘋) 疺
+5	疰疱^SC (=皰) 疲疳疴^SC (=痾) 疵疶疷疸疹疻疼疽疾疿 (=痱) 痀痁痂痃痄病痆症痈^SC (=癰) 痉^SC (=痙)
+6	痊痋痌痍痎痏痐 (=蛔 -> 虫) 痑痒^SC/JP (=癢) 痓痔痕痖^SC (=瘂)
+7	痗痘痙痚痛痜痝痞痟痠痡痢痣痤痥痦痧痨^SC (=癆) 痩^JP (=瘦) 痪^SC (=瘓) 痫^SC (=癇)
+8	痬痭痮痯痰痱痲痳痴痵痶痷痸痹^SC (=痺) 痺痻痼痽痾痿瘀瘁瘂 (=啞 -> 口) 瘃瘄瘅^SC (=癉) 瘆^SC (=瘮)
+9	瘇 (=尰 -> 尢) 瘈瘉 (=癒) 瘊瘋瘌瘍瘎瘏瘐瘑瘒瘓瘔瘕瘖瘗^SC (=瘞) 瘘^SC (=瘺) 瘟瘧
+10	瘙瘚瘛瘜瘝瘞瘠瘡瘢瘣瘤瘥瘦瘨瘩瘪^SC (=癟) 瘫^SC (=癱)
+11	瘬瘭瘮瘯瘰瘱瘲瘳瘴瘵瘶瘷瘸瘹瘺瘻 (=瘺) 瘼瘽瘾^SC (=癮) 瘿^SC (=癭) 癊
+12	癀癁療癃癄 (=憔 -> 心 / 𥡤 -> 禾) 癅 (=瘤) 癆癇癈 (=廢 -> 广) 癉癋癌癍癎 (=癇)
+13	癏 (=瘝) 癐癑癒癓癔癕癖癗癘癙癚癛癜癝癞^SC (=癩)
+14	癟癠癡 (=痴) 癣^SC (=癬)
+15	癢癤癥癦
+16	癧癨癩癪癫^SC (=癲)
+17	癬癭癮
+18	癯癰
+19	癱癲
+21	癳
+23	癴
+25	癵

Fazzioli, Edoardo (1987). Chinese calligraphy : from pictograph to ideogram : the history of 214 essential Chinese/Japanese characters. calligraphy by Rebecca Hon Ko. New York: Abbeville Press. ISBN 0-89659-774-1.
Lunde, Ken (Jan 5, 2009). "Appendix J: Japanese Character Sets" (PDF). CJKV Information Processing: Chinese, Japanese, Korean & Vietnamese Computing (Second ed.). Sebastopol, Calif.: O'Reilly Media. ISBN 978-0-596-51447-1.