Hemorrhoid or cancer? How to tell the difference
Written and medically reviewed by Bahir Hadi, specialist in surgery, PhD
Bleeding from the rectum, a lump at the anal opening, or a change in bowel habits - and suddenly the worrying thought appears: could this be cancer? It is a natural question, and you are far from alone in asking it. On this page, specialist Dr. Bahir Hadi explains the typical differences between hemorrhoids and bowel cancer, and when you should get checked.
Short answer: Rectal bleeding is often caused by a benign condition such as haemorrhoids, but symptoms can overlap with other disease. Bleeding should therefore be assessed, especially with a new or persistent change in bowel habit, unexplained weight loss or feeling generally unwell.
Key differences
The table shows typical patterns, not a reliable way to tell the two apart yourself. Bowel cancer can cause bright red blood and haemorrhoids can cause darker blood, and many people have none of the other symptoms. Use the table to understand what the doctor looks for, not to decide the cause.
| Symptom | Suggests hemorrhoids | Suggests bowel cancer |
|---|---|---|
| Blood colour | Bright red, on the paper or dripping into the bowl | Darker, mixed with the stool |
| Pain | Burning/itching at the anus, worst on defecation | Often painless - or diffuse abdominal pain |
| Lump | Soft, tender bump at the anal opening, often transient | Not visible externally; may be felt on rectal exam |
| Bowel habit | Unchanged or constipated | Persistent change: thinner stools, more/less frequent, urgency |
| Weight loss and fatigue | Rare | Common in advanced disease |
| Age | All ages, mostly 30-60 | Risk rises sharply after 50 |
Remember: you can have both at the same time. Hemorrhoids do not rule out cancer. That is why it is always the doctor's job - not the patient's - to determine the cause.
What are hemorrhoids?
Hemorrhoids are swollen blood vessels in or around the rectum, similar to small varicose veins. They are very common: up to half of adults develop them at some point. Typical symptoms:
- Bright red blood on toilet paper or in the bowl after defecation.
- Itching, burning or swelling at the anus.
- A soft lump that may come and go - especially with constipation, pregnancy or sedentary work.
Most hemorrhoids settle with diet, fluids and exercise. When they do not, we offer gentle treatments - from McGivney rubber-band ligation to surgical removal.
What is bowel cancer - and which symptoms matter?
Bowel (colorectal) cancer is the 3rd most common cancer in Denmark. It usually develops slowly from benign bowel polyps that may become malignant over years. Symptoms not to overlook:
- Blood in the stool - especially dark blood or blood mixed with stool.
- New or persistent change in bowel habit: thinner stools, diarrhoea, constipation or an alternating pattern.
- Sense of incomplete emptying after defecation.
- Unexplained weight loss, fatigue or anaemia.
- Abdominal pain or bloating that does not go away.
Important: Early bowel cancer can be entirely painless. That is precisely why "harmless blood on the paper" should be taken seriously and worked up with a colonoscopy when the doctor considers it indicated.
When should you see a doctor?
Contact your GP without delay if you have one or more of the following:
- You are over 50 and have blood in the stool.
- You have a new or persistent change in bowel habit.
- You have unexplained weight loss or fatigue with gastrointestinal symptoms.
- You have a family history (parent or sibling with bowel cancer).
- Symptoms have returned after earlier treatment for hemorrhoids.
You can also contact the clinic directly. Questions about referral, cover and price are clarified with the clinic or your GP before treatment; see contact.
How is the diagnosis made?
At the surgeon's office, the work-up typically includes:
- Clinical examination - inspection and digital rectal exam. Many hemorrhoids can be seen and felt immediately.
- Anoscopy - examination with a short instrument that gives a view of the anal canal and the lowest part of the rectum, about 5-6 cm from the anal verge.
- Colonoscopy - full scope of the colon if there is suspicion of cancer, polyps or inflammatory bowel disease. Any polyps can be removed during the procedure.
Where there is a justified suspicion of cancer, work-up runs in the Danish cancer fast-track pathway, under the Danish Health Authority standard timeframes.
Read more
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Category: Anal surgery