The single most reliable distinction is location: internal hemorrhoids form inside the rectum, above a boundary called the dentate line, while external hemorrhoids develop under the skin around the anal opening. Because the two types sit in tissues with very different nerve supplies, they tend to announce themselves differently. Internal hemorrhoids usually cause painless bleeding; external hemorrhoids are more likely to hurt. But the line between them blurs more often than people expect, especially when an internal hemorrhoid prolapses and pushes outside the body.
Why the Dentate Line Matters
About two to three centimeters inside the anal canal, there is a ring of tissue called the dentate (or pectinate) line. It marks the transition between the mucosal lining of the rectum and the regular skin of the anus. This boundary is important for one practical reason: the tissue above it has almost no pain-sensing nerves, while the tissue below it is loaded with them. That single anatomical fact explains most of the symptom differences between internal and external hemorrhoids.
Internal hemorrhoids develop above the dentate line, cushioned inside rectal mucosa. Because that tissue lacks pain receptors, you often cannot feel an internal hemorrhoid at all. External hemorrhoids sit below the dentate line, covered by the same nerve-rich skin as the rest of the perianal area. That is why external hemorrhoids can be intensely painful, even when they are small.
Signs That Point to an External Hemorrhoid
External hemorrhoids are, in most cases, the easier type to identify on your own. You can typically see or feel them. They present as a soft or firm lump right at the anal opening, covered by skin rather than the moist pink tissue that lines the inside of the rectum. The skin over an external hemorrhoid may look swollen or slightly discolored.
The hallmark symptom is discomfort, ranging from a dull ache to sharp pain, especially when sitting, wiping, or during a bowel movement. Itching is common as well, particularly if the area stays moist or if stool residue irritates the stretched skin. Bleeding can occur with external hemorrhoids, but it tends to be minor and comes from the surface of the skin rather than from inside the rectum. You are more likely to notice blood on toilet paper than dripping into the bowl.
When an external hemorrhoid has been around for a while and the swelling resolves, it sometimes leaves behind a small flap of stretched skin called a skin tag. These tags are harmless and painless but can be annoying because they make cleaning difficult. Many people mistake a residual skin tag for an active hemorrhoid, which leads to confusion about why it never seems to “heal.”
Signs That Point to an Internal Hemorrhoid
Internal hemorrhoids are sneakier. In their earliest stage, you cannot see or feel them from outside the body at all. The most common tip-off is bright red blood on the toilet paper, on the surface of the stool, or dripping into the bowl after a bowel movement. The bleeding is usually painless, which is the key signal. If you are seeing blood but feeling no pain, an internal hemorrhoid is one of the leading suspects.
Some people notice a sense of incomplete evacuation or mild pressure in the rectum, but many internal hemorrhoids produce no sensation whatsoever. They are frequently discovered incidentally during a routine examination or a procedure done for another reason. A clinician can usually spot them with a quick anoscopy, a brief look inside the anal canal with a small illuminated tube.
The picture changes when an internal hemorrhoid begins to prolapse. Prolapse means the swollen tissue slides downward and pushes out through the anal opening. At that point, you may feel a soft, moist lump protruding during or after a bowel movement. The tissue often looks darker pink or red and feels different from the surrounding skin because it is mucosal tissue, not regular skin. If it stays outside the body long enough, it can become irritated, start to itch, or cause a mucous discharge that stains underwear.
How Doctors Grade Internal Hemorrhoids
Clinicians classify internal hemorrhoids into four grades using what is known as the Goligher system, which is based entirely on how far the tissue prolapses:
- Grade I: No prolapse at all. The hemorrhoid bleeds but stays inside the rectum.
- Grade II: The hemorrhoid prolapses during straining or a bowel movement but slides back inside on its own.
- Grade III: The hemorrhoid prolapses and does not go back on its own, but you can push it back in with a finger.
- Grade IV: The hemorrhoid is permanently prolapsed and cannot be pushed back inside.
This grading system is used widely in clinical practice and research to guide treatment decisions.1PubMed Central. Is the Goligher classification a valid tool in clinical practice and research for hemorrhoidal disease? Grade I and II hemorrhoids are generally managed conservatively, with dietary changes, fiber supplements, and topical treatments. Grade III and IV often call for a procedure.
The grading matters for self-diagnosis because it explains why some people with internal hemorrhoids can feel a lump while others cannot. If yours is Grade I, you will never feel it from outside. If it is Grade III or IV, you might mistake it for an external hemorrhoid because it is sitting outside the body. A permanently prolapsed Grade IV internal hemorrhoid can look dramatic, sometimes presenting with segmental mucosal protrusion and chronic bleeding that leads to anemia.2Academic Medicine & Surgery. Irreducible Grade IV Internal Hemorrhoids With Segmental Mucosal Prolapse At that stage, the visual distinction between a prolapsed internal hemorrhoid and an external one is genuinely difficult for a non-clinician.
When the Two Types Overlap
A surprisingly common situation is having both types at the same time. These are called mixed or combined hemorrhoids. The internal component bleeds and may prolapse; the external component hurts and may thrombose. When both are present, sorting out which symptoms come from which source becomes difficult without a clinical exam.
One useful rule of thumb: if you have a lump you can feel at the anal margin AND painless bleeding that drips into the toilet, you may have both types rather than one or the other. A single external hemorrhoid rarely produces the kind of dripping, bright red bleeding that characterizes internal hemorrhoids. And a single internal hemorrhoid that has not prolapsed cannot cause the localized tenderness that external hemorrhoids are known for. When both symptoms show up together, mixed disease is likely.
Thrombosed Hemorrhoids and Why They Change the Picture
Thrombosis, the formation of a blood clot inside a hemorrhoid, is the complication that sends many people to a doctor in a hurry. It most commonly affects external hemorrhoids. When it happens, a firm, bluish-purple lump appears suddenly at the anal margin. The pain is often severe and constant, sometimes described as a throbbing pressure that makes sitting nearly impossible. The lump is tender to the touch and may feel as hard as a marble.
Thrombosis is one of the hallmarks of an acute hemorrhoidal crisis, alongside heavy bleeding and incarcerated prolapse.3PubMed Central. Management of Acute Hemorrhoidal Crisis: Evaluation, Treatment, and Special Considerations A thrombosed external hemorrhoid can be treated with a small incision to remove the clot if you get to a doctor within the first couple of days, when the pain is worst. After about 72 hours, the body starts to reabsorb the clot on its own, and the pain gradually eases over a week or two, though the process is not pleasant.
Internal hemorrhoids can also thrombose, but it is less common and almost always involves prolapse. When a prolapsed internal hemorrhoid gets trapped outside the body and its blood supply is compromised, the tissue swells, clots, and becomes extremely painful. This is a more urgent situation than a simple external thrombosis because the tissue can become strangulated if it is not reduced.
A Quick Self-Assessment Checklist
No self-exam replaces a clinical evaluation, but these observations can help you communicate more clearly with a healthcare provider when you call or visit:
- Painless bright red bleeding: Most consistent with an internal hemorrhoid, especially if the blood drips into the toilet or coats the stool surface.
- Painful lump at the anal margin: Likely external. If the lump appeared suddenly and is firm, suspect thrombosis.
- Soft, moist tissue protruding during a bowel movement: Likely a prolapsing internal hemorrhoid. If it slides back in on its own, it is probably Grade II. If you need to push it back, Grade III.
- Itching and irritation without a visible lump: Could be either type, but low-grade internal hemorrhoids with mucous discharge are a common cause.
- Pain plus bleeding: Consider a thrombosed external hemorrhoid, a fissure (a small tear in the anal skin), or mixed hemorrhoids.
One thing worth emphasizing: pain alone does not reliably distinguish external from internal. A Grade I internal hemorrhoid is painless. But a strangulated prolapsed internal hemorrhoid is excruciating. And a small, non-thrombosed external hemorrhoid might cause only mild discomfort. Pain is one data point, not the whole answer.
When Bleeding Deserves More Than a Home Diagnosis
Many people assume that rectal bleeding plus a known hemorrhoid history means the bleeding is from the hemorrhoid. That assumption is usually correct, but not always. A study of patients over 40 with prolonged rectal bleeding and confirmed hemorrhoids found that when colonoscopy was performed, roughly one in five had colorectal polyps, and a small number had cancer or other lesions that were unrelated to their hemorrhoids.4PubMed Central. Prolonged rectal bleeding associated with hemorrhoids: the diagnostic contribution of colonoscopy The hemorrhoids were real, but they were not the only thing going on.
This does not mean every episode of hemorrhoid-related bleeding warrants a colonoscopy. But certain patterns should prompt a visit rather than another tube of over-the-counter cream:
- Bleeding that persists for weeks: Even if it seems minor, ongoing bleeding that does not respond to fiber and topical treatment deserves investigation.
- A change in bowel habits: New constipation, diarrhea, or narrower stools alongside bleeding can signal something beyond hemorrhoids.
- Dark or maroon-colored blood: Hemorrhoid bleeding is classically bright red. Darker blood suggests a source higher up in the colon.
- Age over 40-45 with new rectal bleeding: Even with a visible hemorrhoid, the chance of a coincidental polyp or other lesion rises enough to justify a look.
- Unexplained weight loss or fatigue: These systemic symptoms alongside rectal bleeding should always be evaluated.
The core point is that hemorrhoids are extremely common, and so are other colorectal conditions. Having one does not protect you from having the other. A clinician who examines you can determine whether the bleeding pattern matches what the hemorrhoid would explain, or whether further evaluation is needed.
How Treatment Differs Based on Type
First-line management is the same for both types: increase fiber intake, drink more water, avoid prolonged straining on the toilet, and use sitz baths (sitting in a few inches of warm water for 10 to 15 minutes) to reduce swelling and discomfort. Over-the-counter creams and suppositories can help with itching and mild pain. These steps resolve the majority of mild hemorrhoid flares regardless of type.
When conservative measures are not enough, the paths diverge. Internal hemorrhoids have a range of office-based procedures available. Rubber band ligation, where a small band is placed around the base of the hemorrhoid to cut off its blood supply, is the most widely used. Endoscopic ligation is a related technique that uses an endoscope and has shown good long-term results for symptomatic internal hemorrhoids.5PubMed Central. Long-term outcome and efficacy of endoscopic hemorrhoid ligation for symptomatic internal hemorrhoids Infrared coagulation and sclerotherapy (injecting a solution that shrinks the tissue) are other options, particularly for Grade I and II hemorrhoids.
External hemorrhoids do not respond to banding or sclerotherapy because the tissue they sit in is pain-sensitive skin. Placing a rubber band on an external hemorrhoid would be agonizing. When an external hemorrhoid needs procedural treatment, the options are typically excision (surgical removal) or, in the case of a thrombosed hemorrhoid seen early, incision and clot removal. Surgical hemorrhoidectomy, the full excision of hemorrhoid tissue, is generally reserved for severe cases of either type or for Grade III and IV internal hemorrhoids that have not responded to less invasive approaches.3PubMed Central. Management of Acute Hemorrhoidal Crisis: Evaluation, Treatment, and Special Considerations
Common Mistakes People Make When Self-Diagnosing
The most frequent error is assuming any lump near the anus is a hemorrhoid. Several other conditions can mimic hemorrhoids: anal fissures cause pain and bleeding but involve a tear rather than a swollen cushion. Perianal abscesses produce a painful, warm lump that can look similar to a thrombosed hemorrhoid but is actually an infection that needs drainage. Anal fistulas, skin tags from prior hemorrhoid episodes, and, rarely, anal or rectal tumors can all be confused with hemorrhoids by someone doing a self-exam.
Another common mistake is equating “painless” with “not serious.” A painless internal hemorrhoid bleeding small amounts is usually benign, but painless bleeding can also come from polyps or other lesions higher in the colon. The absence of pain tells you where the source likely is (above the dentate line), not what it is.
People also tend to over-treat with topical products. Hemorrhoid creams containing hydrocortisone are meant for short-term use, generally no more than a week. Prolonged application can thin the perianal skin and actually worsen irritation. If you have been using a cream for weeks without improvement, the issue may not be a simple hemorrhoid, or the hemorrhoid may need a procedure rather than more cream.
What a Clinical Exam Actually Involves
If you are unsure whether your hemorrhoid is internal or external, a visit to a primary care doctor or gastroenterologist can resolve the question quickly. The exam is brief and, despite its reputation, usually less uncomfortable than people fear. A visual inspection of the perianal area identifies external hemorrhoids immediately. A digital rectal exam, where the clinician inserts a gloved, lubricated finger, can detect some internal hemorrhoids by feel, though small ones are easy to miss this way.
Anoscopy provides the clearest view. The clinician inserts a short, rigid tube with a light source a few centimeters into the anal canal. This takes seconds and allows direct visualization of internal hemorrhoids, their size, and their grade. It also rules out other conditions like fissures or polyps low in the rectum. For bleeding that has been going on for a while or in anyone with risk factors for colorectal disease, a colonoscopy may be recommended to examine the entire colon.
The reluctance to have this type of exam evaluated is understandable, but it frequently leads to months of unnecessary self-treatment and anxiety. Most hemorrhoid evaluations take under ten minutes and provide a definitive answer that lets you and your doctor choose the right treatment the first time rather than guessing.