How to say "irritation" in Japanese

• 刺激しげきJLPT N3approx.Common
  noun, suru verb, transitive verbPhysical irritation of the skin, eyes, and similar body parts, produced by something acting from outside. The word's basic sense is stimulus or stimulation, so this use arises when a stimulus affects the body.
  光ひかりが刺激しげきとなって花はなが咲さく。↗

  Light is the stimulus that causes a flower to open.
• 炎症えんしょうCommon
  nounInflammation in the medical sense; its 'irritation' is bodily, as when a doctor finds a throat red and inflamed. It is not the word for feeling irritated.
  歯茎はぐきが炎症えんしょうを起おこしているようなのですが。↗

  I think I have a gum infection.
• 焦燥しょうそうCommon
  noun, suru verb, intransitive verbEmotional irritation: the impatient, frustrated feeling that builds when you are kept waiting or things will not go as planned. Close to fretfulness, and distinct from any physical sense.

For irritation of the body choose 刺激 (a stimulus affecting skin or eyes), for medically inflamed tissue choose 炎症, and for the emotional feeling of impatience and frustration choose 焦燥.

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

• 刺激しげきstimulus
• 炎症えんしょうinflammation
• 焦燥しょうそうimpatience
• 癪しゃくannoyance
• 苛立ちいらだちirritation
• 中っ腹ちゅうっぱらanger (held in check)
• 刺激性しげきせいirritativeness
• 焮衝きんしょうinflammation
• 憤懣ふんまん(pent-up) anger
• 心気しんきfretfulness