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Persly 医療専門チームPersly 医療専門チーム
2025年12月29日5分で読める

胃がんで血便は起こる?原因と対応を解説

要点:

胃がんにおける血便:起こり得る症状・原因・対応

胃がんで血便(便に血が混じる)は「起こり得る症状」ですが、必ず出るわけではありません。 [1] 胃からの出血は便が黒くなる「黒色便(メレナ)」として見られることが多く、鮮やかな赤色の血便は大腸側の出血で目立つことが一般的です。 [2] [3] 一方で、血便という表現には黒色便も含まれ、胃がんの症状リストにも血便が挙げられています。 [1]

血便が起こるメカニズム

  • 胃がん病変に潰瘍(粘膜の深い傷)ができ、そこから出血するためです。 [4] 出血した血液が腸を通過する間に消化され、便が黒色(タール状)になります。 [2]
  • 出血量や場所により、吐血(口から血を吐く)や黒色便として現れることがあります。 [3] [2]

色で推測する出血部位の目安

  • 黒色便(タール便):上部消化管(食道・胃・十二指腸)からの出血のことが多いです。 [2]
  • 鮮紅色の血便:大腸・直腸・肛門周辺の出血(痔など)で見られやすいです。 [5] [3]
  • ただし色だけで断定はできず、内視鏡などの検査で確認が必要です。 [6] [7]

胃がん以外で血便が出る主な原因

  • 消化性潰瘍(胃・十二指腸潰瘍)などの上部消化管出血。 [3]
  • 大腸の病気(大腸炎、憩室、ポリープ、大腸がん、血管異常、痔など)。 [3]
  • 消化管全体の出血を含む「消化管出血」の一症状として血便が現れます。 [8] [3]

受診の目安(緊急度)

  • 大量の出血、ふらつき・動悸・息切れ・失神感がある場合は救急受診が推奨されます。 [9] [2]
  • 少量でも血便が続く、黒色便が繰り返し見られる、体重減少や貧血を伴う場合は早めに消化器内科を受診しましょう。 [1] [2]

診断に用いられる検査

  • 便検査(便中の目に見えない血液の確認)。 [10]
  • 上部内視鏡(胃カメラ):出血源の確認と止血処置が可能です。 [6] [11]
  • 下部内視鏡(大腸内視鏡):鮮紅色血便や大腸病変が疑われる時に行います。 [7]
  • 血液検査(貧血、凝固能、肝機能など)。 [10]

管理・治療のポイント

  • まずは出血の原因部位を特定し、止血を最優先します。多くは内視鏡的な止血(薬剤散布・注射、クリップ、熱凝固など)で対応します。 [6]
  • 出血量が多い場合は、輸液や輸血と並行して内視鏡を早期に実施します。特に循環不安定や再出血が疑われるケースでは迅速な内視鏡が推奨されます。 [6] [12]
  • 胃がんが原因であれば、腫瘍の進展度に応じて外科手術、内視鏡治療、薬物療法(化学療法など)を含む総合的な治療計画が必要になります。 [1]

自分でできる初期対応のコツ

  • 出血の色(黒色か鮮紅色か)、量、頻度、腹痛やめまいの有無をメモしましょう。受診時に役立ちます。 [2]
  • ふらつきや動悸がある場合は安静にして、速やかに医療機関へ連絡・受診しましょう。 [9]
  • 鉄剤やビスマス製剤(胃腸薬)で便が黒くなることがありますが、出血の可能性が否定できない場合は受診が望ましいです。 [2]

まとめ

  • 胃がんで血便(特に黒色便)は「起こり得る重要な症状」です。 [1] [2]
  • 色の違いで出血部位の目安はつきますが、確定には内視鏡などの検査が必要です。 [6] [11]
  • 大量出血や全身症状があるときは救急受診、少量でも繰り返す血便や黒色便は消化器内科で評価を受けましょう。 [9] [2]

関連する質問

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PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid.... (message truncated) PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid... (end) PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid. PMID: unknown. Invalid.

関連記事

出典

  1. 1.^abcde위암(Stomach cancer) | 질환백과 | 의료정보 | 건강정보(amc.seoul.kr)
  2. 2.^abcdefghij위장관 출혈(Gastrointestinal hemorrhage) | 질환백과 | 의료정보 | 건강정보(amc.seoul.kr)
  3. 3.^abcdef위장관 출혈(Gastrointestinal hemorrhage) | 질환백과 | 의료정보 | 건강정보(amc.seoul.kr)
  4. 4.^영남대학교병원(yumc.ac.kr)
  5. 5.^항문출혈 | 증상 | 의료정보 | 건강정보(amc.seoul.kr)
  6. 6.^abcde위장관 출혈(Gastrointestinal hemorrhage) | 질환백과 | 의료정보 | 건강정보(amc.seoul.kr)
  7. 7.^abGastrointestinal Bleeding(medlineplus.gov)
  8. 8.^위장관 출혈 | 증상 | 의료정보 | 건강정보(amc.seoul.kr)
  9. 9.^abcBlood in stool in adults(mayoclinic.org)
  10. 10.^abGastrointestinal bleeding - Diagnosis and treatment(mayoclinic.org)
  11. 11.^abGastrointestinal bleeding - Diagnosis and treatment(mayoclinic.org)
  12. 12.^상부위장관 출혈의 치료: 소화성궤양 출혈을 중심으로(ekjm.org)

ご注意: この情報は教育目的のみで提供されており、専門的な医療アドバイス、診断、または治療に代わるものではありません。医療上の決定を行う前に、必ず資格のある医療提供者に相談してください。