noun
Refers to the disease in medical and everyday contexts. Can be used literally or figuratively for something that spreads harmfully.
父は去年、胃がんと診断された。
My father was diagnosed with stomach cancer last year.
喫煙は肺がんのリスクを高める。
Smoking increases the risk of lung cancer.
The kanji 癌 is a phono-semantic compound: the radical 疒 (sickness) combined with 嵒 (rocky cave), possibly suggesting a hard, lump-like growth. The reading がん is the on'yomi. The word is commonly written in kana.