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intestine; bowel
「腸」 has other readings with different meanings.
腸の調子が悪くて、お腹が痛いです。
My intestines are not feeling well, and my stomach hurts.
ヨーグルトは腸にいい食べ物です。
Yogurt is a food that is good for the intestines.
医者に腸の検査をしてもらいました。
I had my intestines examined by a doctor.