Internal vs. External Hemorrhoids

The distinction between internal and external hemorrhoids comes down to one anatomical line — the dentate line — and that single distinction explains most of the difference in symptoms, pain level, and treatment approach between the two.

Key takeaways

Internal hemorrhoids form above the dentate line, in tissue with limited pain sensation — often painless even when they bleed.
External hemorrhoids form below the dentate line, in nerve-rich tissue — can be quite painful, especially if a clot forms (thrombosis).
Many people have both at the same time, and treatment approaches differ somewhat between the two.

The anatomical dividing line

The dentate line marks a transition in the type of tissue lining the anal canal — above it, tissue has limited pain-sensitive nerve supply; below it, tissue is much more richly innervated, similar to skin elsewhere on the body. This single anatomical fact explains most of the practical differences between internal and external hemorrhoids.

Internal hemorrhoids

Located above the dentate line
Often painless, even when actively bleeding — this is a genuinely important point, since painless bleeding is easy to dismiss but is exactly the symptom pattern this site’s differential diagnosis content addresses
Graded I–IV based on degree of prolapse (see Hemorrhoid grades I–IV explained)
Can prolapse (protrude) with straining, sometimes needing to be pushed back in, or in advanced cases staying prolapsed permanently

External hemorrhoids

Located below the dentate line, under the skin around the anus
Can be quite painful, given the nerve-rich tissue involved
Can develop a blood clot (thrombosis), causing sudden, significant pain — see Thrombosed external hemorrhoid
Often felt as a firm lump rather than primarily noticed through bleeding

Having both at once

It’s common to have both internal and external hemorrhoids simultaneously, since both develop from the same underlying pressure-related mechanism (see Why do hemorrhoids happen?) — this is sometimes referred to as combined or mixed hemorrhoidal disease.

Why the distinction matters for treatment

Internal hemorrhoids are the primary target of most office procedures (rubber band ligation, sclerotherapy, infrared coagulation) covered in this site’s procedures section
External hemorrhoids, particularly if thrombosed, are more often addressed with cold therapy, pain management, or in an acute painful case, an in-office incision and drainage procedure
Surgery (hemorrhoidectomy) can address both internal and external disease in the same procedure, which is one reason it’s preferred for combined, more advanced disease

How to tell which you might have

Painless bleeding without a noticeable external lump suggests internal hemorrhoids; a painful lump you can feel suggests external (particularly if it developed suddenly and is very tender, possibly thrombosed). This isn’t a reliable self-diagnosis tool on its own — a doctor’s exam, including a digital rectal exam and possibly anoscopy, confirms which type (or both) is present.

Want to understand the grading system for internal hemorrhoids specifically? See Hemorrhoid grades I–IV explained.

This page is for general education.