How to say "blood" in Japanese

• 血ちJLPT N4approx.Common
  nounThe everyday word for blood, meaning the liquid itself in the body. Use it in ordinary speech and writing whenever you simply mean blood, as of a wound or bleeding.
  ナイフは血ちに塗まみれていた。↗

  The knife was covered in blood.
• 血液けつえきJLPT N2approx.Common
  nounBlood as a substance viewed medically or scientifically. This is the word you meet in medical and scientific contexts, where blood is discussed as a bodily fluid rather than seen or shed.
  血液けつえきは体内たいないを循環じゅんかんする。↗

  Blood circulates through the body.
• 血の気ちのけCommon
  expression, nounNot blood as a substance but the blood that shows as colour in the face or cheeks, especially when it drains away. It is really about complexion, seldom the word you want for blood itself.
  彼女かのじょの顔かおには血の気ちのけがなかった。↗

  Her face was the color of chalk.

Use 血 for blood in everyday senses, 血液 for blood discussed medically or scientifically, and 「血の気」 only for the blood that shows as colour in the face, not for blood itself.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 血ちblood
• 血液けつえきblood
• 血の気ちのけblood (in one's face, cheeks, etc.)
• ブラッドblood
• 紅血こうけつred blood