Internal and External Hemorrhoids

In brief: Internal and external hemorrhoids are vascular cushions on different sides of the dentate line, where sensory innervation and typical symptom patterns differ.

Use in hemorrhoids

Internal hemorrhoids originate above the dentate line. They often cause painless bright red bleeding or prolapse, although prolapse, strangulation, ulceration, or a coexisting condition can cause discomfort. Internal prolapse is described separately from external swelling. [1]

External hemorrhoidal tissue lies below the dentate line in pain-sensitive skin. Acute thrombosis can create a tender bluish lump and substantial pain; an external skin tag may remain after resolution. External tissue does not become a Goligher grade IV internal hemorrhoid, while mixed disease can contain both components. [2]

Clinical detail

The dentate line guides anatomy and procedural pain avoidance, but symptoms are not perfectly binary. Bleeding does not prove an internal hemorrhoid, pain does not prove external thrombosis, and visible prolapse may include mucosa or another anorectal disorder. Examination defines the actual anatomy before treatment.