When an anal fissure needs more tests

This page is about the exam the fissure sources describe. It is general information. ahem does not perform exams.

Mayo Clinic dates its fissure treatment page December 31, 2024. On the copy opened October 26, 2026, a clinician will likely ask about medical history and do a physical exam, including a gentle inspection of the anal region. Often the tear is visible. Usually that exam is all that is needed to diagnose an anal fissure.

The same page, checked October 26, 2026, describes what the tear can look like. A more recent, acute fissure looks like a fresh tear, somewhat like a paper cut. A chronic fissure likely has a deeper tear and may have internal or external fleshy growths. Mayo Clinic considers a fissure chronic if it lasts more than eight weeks. The healing course around that mark is on how long an anal fissure takes to heal.

MedlinePlus, reviewed April 11, 2026 and opened October 26, 2026, says the clinician performs a rectal exam and looks at the anal tissue. It says an anal fissure can be seen as a crack when the area is stretched slightly. How that tear differs from a swollen vein is on hemorrhoids and anal fissures.

MedlinePlus says the fissure is almost always in the middle. Mayo Clinic uses location as a clue to cause. On the treatment page checked October 26, 2026, a fissure on the side of the anal opening, rather than the back or front, is more likely to be a symptom of another condition, such as Crohn's disease. A clinician may recommend further testing to look for an underlying condition.

The symptoms page, also dated December 31, 2024, lists less common causes that sit behind that concern: Crohn's disease or another inflammatory bowel disease, anal cancer, HIV, tuberculosis, and syphilis. Common causes on that page are large or hard stools, constipation and straining, long-lasting diarrhea, anal intercourse, and childbirth. MedlinePlus says adult fissures may follow large hard stools or long-lasting diarrhea, and that fissures are also common after childbirth and in people with Crohn disease. The side-of-the-opening sentence is Mayo Clinic's. The middle-of-the-opening sentence is MedlinePlus.

When Mayo Clinic moves past a look, the treatment page checked October 26, 2026 names three tests. Anoscopy uses a tubular device inserted into the anus to see the rectum and anus. Flexible sigmoidoscopy uses a thin flexible tube with a camera to see the bottom portion of the colon. Colonoscopy uses a flexible tube to inspect the entire colon.

The same page splits the longer scopes by age and by other clues. Flexible sigmoidoscopy may be done for people younger than 45 who have no risk factors for intestinal diseases or colon cancer. Colonoscopy may be done for someone older than 45, someone with risk factors for colon cancer, someone with symptoms of other conditions, or someone with other symptoms such as stomach pain or diarrhea. Those ages are Mayo Clinic's, on a page dated December 31, 2024 and opened October 26, 2026. MedlinePlus does not print 45.

A hemorrhoid exam has its own scope list. Mayo Clinic's hemorrhoid page ties colonoscopy to another digestive disease, colorectal cancer risk, or being middle-aged without a recent colonoscopy, and it does not use this fissure page's age 45 line. That exam is on what a hemorrhoid exam checks.

MedlinePlus, opened October 26, 2026, says other tests that may be done include anoscopy, sigmoidoscopy, biopsy, and colonoscopy. Anoscopy is an examination of the anus, anal canal, and lower rectum. Sigmoidoscopy examines the lower part of the large intestine. Biopsy removes rectal tissue for examination. Colonoscopy examines the colon. The page does not sort those tests by age or by whether the tear is in the middle.

• Tear visible on a gentle look: Mayo Clinic says that exam is usually enough.
• Tear almost always in the middle: MedlinePlus. A tear on the side: Mayo Clinic says another condition, such as Crohn's disease, is more likely, and further tests may follow.
• Younger than 45 and no named risk factors: Mayo Clinic says flexible sigmoidoscopy may be the longer scope. Older than 45, cancer risk factors, or symptoms such as stomach pain or diarrhea: Mayo Clinic says colonoscopy may be done.
• Biopsy: MedlinePlus lists it. The Mayo Clinic fissure treatment page opened the same day does not.