• 頭痛ずつう — Headache
• 腹痛ふくつう — Stomachache
• 激痛げきつう — Sharp pain
• 心痛しんつう — Heartache / mental suffering
• 痛いたみ — Pain / ache
• 痛手いたで — Serious blow / setback

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The left radical 疒 indicates illness, while the right component 通 (ツウ) lends its sound. Together they convey the concept of pain—physical or emotional.

“痛い” is among the most common ways to express discomfort in daily Japanese, so this kanji appears frequently in everyday contexts and medical terms.

頭あたまが 痛いたいです。
I have a headache.

その言葉ことばに 心こころが 痛いたんだ。
Those words hurt my heart.