瘍 — “Swelling / Boil / Tumor” in Japanese

Master (高手)よう, かさ

Radical ⽧ · radical 104 The building block this kanji is filed under

“Swelling / Boil / Tumor” in Japanese is 瘍, read you, kasa (よう, かさ). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 腫瘍 (tumor).

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What does 瘍 mean?

Full details, readings & example

Kanji	瘍
Meaning	Swelling / Boil / Tumor
Readings	よう, かさ
Grade	Master (高手 · secondary school)
Curriculum	Jōyō kanji · Japanese secondary school (JLPT N1–N2)
Example	腫瘍 (tumor)

How to read 瘍

瘍 is read you (よう) or kasa (かさ) depending on the word.

Words with 瘍

腫瘍
潰瘍

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Kanji read the same way as 瘍

Same sound, different character — the classic trap. Compare them side by side:

Updated: 2026-08-28