Blood in stool

Blood in the stool: causes, examination, and treatment

If you notice blood in your stool, it is natural to be concerned. This symptom should always be taken seriously and examined by a specialist, regardless of whether it is a small amount of fresh blood on the toilet paper or darker blood mixed in with the stool. At Kirurgen.dk, we have extensive experience in investigating the causes of rectal bleeding, so we can initiate the right treatment as quickly as possible.

Common and benign causes

In many cases, bleeding is caused by harmless conditions. The most common causes include:

• Hemorrhoids: This is one of the most common causes of bright red blood. Hemorrhoids are enlarged blood vessels at the opening of the rectum, which can cause itching, burning, and bleeding, often when going to the toilet.

• Fissures (anal fissures): Small tears in the mucous membrane at the opening of the rectum can occur due to hard stools. This often causes sharp pain and small amounts of fresh blood.

• IBD (Inflammatory Bowel Disease): Diseases such as ulcerative colitis or Crohn's disease (collectively referred to as IBD) can cause inflammation of the intestine, often resulting in bloody diarrhea and abdominal pain.

Focus on early detection of colorectal cancer

Although the cause is often benign, the most important reason for being examined is to rule out serious diseases such as colon cancer (colorectal cancer) or rectal cancer. With early detection of colon or rectal cancer, the prognosis for recovery is very good today.

The symptoms of cancer can be similar to those of hemorrhoids or IBD, which is why a visual examination of the inside of the intestine is necessary to make an accurate diagnosis. During a colonoscopy, the specialist can also remove polyps, which are precursors to cancer, thereby preventing the disease from developing.

How is the examination conducted?

When you are referred to us due to blood in your stool, we will typically conduct a thorough consultation followed by a clinical examination. Depending on your symptoms and age, a colonoscopy or sigmoidoscopy may be necessary. This allows us to look directly at the mucous membrane and take tissue samples if any changes are found.

Our goal is to provide you with a quick diagnosis so that you don't have to worry unnecessarily for too long. By responding to symptoms such as changes in bowel habits or blood in the stool, you are taking responsibility for your health.

Ofte stillede spørgsmål om blod i afføring (FAQ)

Her finder du svar på de mest almindelige spørgsmål om blødning fra endetarmen. Husk, at blod i afføringen altid bør undersøges af en læge for at fastlægge den præcise årsag.

Er det altid farligt at have blod i afføringen?

Nej, i mange tilfælde skyldes blødningen godartede tilstande som hæmorider eller små rifter (analfissurer). Men da symptomerne kan overlappe med mere alvorlige sygdomme, er det afgørende at blive undersøgt af en speciallæge for at udelukke polypper eller tarmkræft.

PubMed Dokumentation:

• Wong, M. C., et al. (2016). Global patterns and time trends of colorectal cancer incidence and mortality. Gut. – Studiet understreger vigtigheden af tidlig diagnostik ved symptomer som blødning for at forbedre prognosen markant.

• Peery, A. F., et al. (2015). Burden of Gastrointestinal, Liver, and Pancreatic Diseases in the United States. Gastroenterology. – Dokumenterer at hæmorider og fissurer er de hyppigste årsager til rektal blødning i den generelle befolkning.

Hvad er forskellen på lyst og mørkt blod i afføringen?

Lyst, rødt blod på papiret eller uden på afføringen stammer typisk fra den nederste del af tarmen eller endetarmsåbningen (f.eks. hæmorider). Mørkt eller sort blod, som er blandet ind i afføringen, kan tyde på en blødning højere oppe i tyktarmen eller mavesækken. Begge dele kræver lægelig vurdering.

PubMed Dokumentation:

• Lane, S. K., et al. (2004). Evaluation of bloody stools. American Family Physician. – En gennemgang af de kliniske forskelle på øvre og nedre gastrointestinal blødning baseret på blodets farve og konsistens.

Hvornår bør jeg søge læge med det samme?

Du bør kontakte en læge hurtigst muligt specielt, hvis blødningen ledsages af ændrede afføringsvaner (f.eks. vedvarende diarré eller forstoppelse), uforklarligt vægttab, mavesmerter eller hvis du føler dig usædvanlig træt (tegn på blodmangel).

PubMed Dokumentation:

• Hamilton, W., et al. (2005). Clinical features of colorectal cancer before diagnosis: a population-based case-control study. British Journal of Cancer. – Identificerer “red flag” symptomer, herunder blødning kombineret med ændrede afføringsvaner, som stærke indikatorer for tarmkræft.

Kan man selv mærke, om blodet skyldes hæmorider eller kræft?

Nej, det er umuligt at mærke forskel selv. Selv hvis man tidligere har haft hæmorider, kan nye blødninger skyldes noget andet. En kikkertundersøgelse (koloskopi eller sigmoideoskopi) er den eneste sikre måde at inspicere slimhinden og udelukke alvorlig sygdom.

PubMed Dokumentation:

• Rinesmith, S. E., et al. (2005). Colorectal cancer screening and surveillance. Gastroenterology Nursing. – Forklarer hvorfor visuel inspektion via endoskopi er guldstandarden for at skelne mellem godartede og ondartede forandringer.