Hemorrhoids: Types, Causes, Grades, and When to See a Doctor
The word “hemorrhoids” is often used to describe almost any pain, bleeding, or lump around the anus, but that is not always accurate.
Hemorrhoidal tissue is actually part of normal human anatomy. These vascular cushions help contribute to normal closure of the anal canal. A problem develops when this tissue becomes enlarged, displaced, thrombosed, or symptomatic.[1][2]
Hemorrhoids may be internal, external, or combined. The commonly used grades I–IV mainly describe the degree of prolapse of internal hemorrhoids rather than all hemorrhoids in general.
- Hemorrhoidal tissue is a normal anatomical structure; hemorrhoidal disease develops when it becomes enlarged or symptomatic.
- Hemorrhoids are mainly classified as internal or external, and both types can coexist.
- Grades I–IV primarily describe prolapse of internal hemorrhoids.
- Constipation, straining, prolonged toilet sitting, pregnancy, and other pressure-related factors are associated with hemorrhoidal disease.
- Rectal bleeding should not automatically be assumed to come from hemorrhoids.
- Diagnosis usually begins with history and examination, with additional anorectal or colon evaluation used selectively.
- What are hemorrhoids?
- What are the different types?
- Internal vs external hemorrhoids
- What are grades I–IV?
- What causes hemorrhoids?
- Who is more likely to develop them?
- How do hemorrhoids usually present?
- How are hemorrhoids diagnosed?
- Is every anal symptom caused by hemorrhoids?
- When should you see a doctor?
- Frequently asked questions
What Are Hemorrhoids?
Hemorrhoidal cushions contain blood vessels, connective tissue, and a small amount of muscle within and around the anal canal.[2]
Everyone has this tissue, so simply having hemorrhoidal cushions is not a disease.
The term hemorrhoidal disease generally refers to the situation in which this tissue enlarges, prolapses, becomes thrombosed, or starts causing symptoms.
Treatment is not required simply because hemorrhoidal tissue exists. Management is considered when the tissue becomes symptomatic or when the nature of the symptoms requires medical evaluation.[2]
What Are the Types of Hemorrhoids?
The main classification is based on the location of the hemorrhoidal tissue relative to an anatomical landmark inside the anal canal called the dentate line.[1]
- Internal hemorrhoids: originate above the dentate line.
- External hemorrhoids: occur below the dentate line and are covered by sensitive skin and anoderm.
- Combined hemorrhoids: contain both internal and external components.
Internal and external hemorrhoids can coexist in the same person.[1]
What Is the Difference Between Internal and External Hemorrhoids?
| Feature | Internal Hemorrhoids | External Hemorrhoids |
|---|---|---|
| Location | Above the dentate line | Below the dentate line |
| Covering | Rectal mucosa with less pain sensitivity | Sensitive anoderm and skin |
| Typical issue | Bleeding or prolapse may occur | An external lump may occur, particularly with thrombosis |
| Graded I–IV? | Yes, according to prolapse | Not classified using the same grading system |
We cover external disease separately in External Hemorrhoids: What Does a Painful Lump Mean and When Should It Be Checked?.
What Are the Four Grades of Internal Hemorrhoids?
Internal hemorrhoids are commonly graded according to the extent of prolapse.[5]
| Grade | Meaning |
|---|---|
| Grade I | Internal hemorrhoids are prominent but do not prolapse outside the anal canal. |
| Grade II | They prolapse with straining but return inside spontaneously. |
| Grade III | They prolapse and require manual reduction. |
| Grade IV | They remain prolapsed and cannot be manually reduced in the usual way. |
Hemorrhoid grade mainly describes prolapse. It does not fully capture bleeding, discomfort, external disease, or the impact on daily life. Management therefore depends on more than the grade number alone.
What Causes Hemorrhoids?
There is no single cause in every patient.
Hemorrhoidal disease is associated with increased pressure in the anorectal area and changes in the supporting tissues of the hemorrhoidal cushions.
Factors associated with hemorrhoids include:[3]
- Repeated straining during bowel movements.
- Chronic constipation.
- Chronic or recurrent diarrhea.
- Spending prolonged periods on the toilet.
- A low-fiber diet.
- Pregnancy.
- Age-related weakening of supporting tissues.
- Frequent heavy lifting.
Does Constipation Cause Hemorrhoids?
Constipation and repeated straining are important risk factors for symptomatic hemorrhoidal disease.[1][3]
This does not mean that everyone with constipation will develop hemorrhoids, but repeated straining increases pressure on the hemorrhoidal tissue.
Can Hemorrhoids Cause Constipation?
The relationship usually runs in the opposite direction: constipation contributes to hemorrhoids.
However, a person experiencing painful bowel movements may delay going to the toilet, which can indirectly worsen constipation.
Does Sitting Cause Hemorrhoids?
One particularly relevant habit is spending a long time sitting on the toilet, especially while straining.[3]
Long toilet sessions while using a phone, for example, are not helpful for someone prone to hemorrhoidal symptoms.
Who Is More Likely to Develop Hemorrhoids?
Pregnancy
Pregnancy is a recognized risk factor because pressure within the pelvic area increases, and constipation may also become more common.[3]
Increasing Age
The supporting tissues of the anus and rectum can weaken with age, making hemorrhoidal tissue more likely to enlarge or prolapse.[3]
Chronic Bowel-Habit Problems
Both chronic constipation and chronic diarrhea can be associated with hemorrhoidal disease.
How Do Hemorrhoids Usually Present?
The presentation depends substantially on the type.
Internal hemorrhoids may be associated with bleeding or prolapse, whereas external hemorrhoids may cause a lump or discomfort, particularly when thrombosis occurs.[3]
We intentionally do not expand that section here because bleeding, pain, itching, and warning signs have their own search intent.
See Hemorrhoid Symptoms: Bleeding, Pain, and Signs You Should Not Ignore.
Hemorrhoids are a common cause of rectal bleeding, but colorectal cancer, inflammatory bowel disease, and other conditions can also cause bleeding. Current colorectal guidelines specifically warn against automatically attributing rectal bleeding to hemorrhoids.[1]
How Are Hemorrhoids Diagnosed?
Diagnosis is usually clinical rather than based on a specific blood test or scan.
The ASCRS guideline recommends a focused disease-specific history and physical examination addressing symptom duration, severity, and relevant risk factors.[1]
Medical History
Your clinician may ask about:
- The nature and duration of the problem.
- Bleeding, prolapse, or pain.
- Constipation or diarrhea.
- Straining and bowel habits.
- Fiber intake.
- Previous treatments.
- Relevant personal or family colorectal history.
External Inspection
External hemorrhoids, prolapsed tissue, swelling, skin irritation, and other visible anorectal abnormalities may be identified by examination.[4]
Digital Rectal Examination
A digital rectal examination may help assess the anorectal area, sphincter tone, and other possible pathology.[1]
Anoscopy
Anoscopy may be used to examine internal hemorrhoidal anatomy and look for other conditions within the anal canal.[1][4]
Does Everyone With Hemorrhoids Need a Colonoscopy?
No.
Colonoscopy is not automatically required for every person with hemorrhoids.
However, complete colon evaluation may be indicated in selected patients with rectal bleeding, particularly when the bleeding source is unclear, additional abdominal or bowel symptoms are present, or colorectal screening is otherwise due.[1]
Finding hemorrhoids does not prove that they are responsible for every episode of rectal bleeding. Hemorrhoids and another colorectal condition can exist at the same time.
Is Every Anal Symptom Caused by Hemorrhoids?
No.
Conditions that can produce similar complaints include:
- Anal fissure.
- Anal fistula or abscess.
- Proctitis or inflammatory bowel disease.
- Rectal prolapse.
- Other colorectal and anal disorders.
This is why a patient's description of “hemorrhoids” should not be considered a medical diagnosis by itself.[2]
Can Hemorrhoids Turn Into Cancer?
Hemorrhoids are not cancer and are not treated as a precancerous condition.
The important issue is that symptoms such as rectal bleeding may overlap with colorectal or anal disease, which is why unexplained bleeding needs appropriate assessment.
When Should You See a Doctor?
Medical assessment is recommended for rectal bleeding and when presumed hemorrhoid symptoms persist, recur, worsen, or do not improve as expected.[3]
Evaluation is also important when there is a new change in bowel habits or when the diagnosis is uncertain.
Heavy or continuous rectal bleeding, particularly when accompanied by dizziness, lightheadedness, weakness, or fainting, requires urgent medical assessment rather than assuming hemorrhoids are the cause.[6]
Do All Hemorrhoids Need Treatment or Surgery?
No.
The presence of hemorrhoidal tissue does not automatically require an operation. Management depends on symptoms, hemorrhoid type, prolapse grade, and the individual's circumstances.
See Hemorrhoid Treatment: When Is Conservative Care Enough and When Is a Procedure Needed?.
If surgery eventually needs to be considered, continue to Hemorrhoid Surgery: Options, Recovery, and When Surgery Is Recommended.
The General Surgery Department at Mouwasat Hospital provides care for anal and rectal conditions including hemorrhoids, anal fissures, and fistulas.
Frequently Asked Questions About Hemorrhoids
What is the difference between internal and external hemorrhoids?
Internal hemorrhoids originate above the dentate line, while external hemorrhoids occur below it and are covered by more pain-sensitive tissue.
Do hemorrhoid grades apply to external hemorrhoids?
The standard grades I–IV are primarily used to classify internal hemorrhoids according to prolapse.[5]
What is a grade I hemorrhoid?
Grade I internal hemorrhoids remain inside the anal canal and do not prolapse.
What is a grade IV hemorrhoid?
Grade IV internal hemorrhoids remain prolapsed and cannot usually be manually reduced.
Are hemorrhoids contagious?
No. Hemorrhoids are not an infection and cannot be transmitted from one person to another.
Does constipation cause hemorrhoids?
Chronic constipation and repeated straining during bowel movements are important risk factors.
Can diarrhea contribute to hemorrhoids?
Yes. Chronic or recurrent diarrhea is also associated with hemorrhoidal disease.[3]
Are hemorrhoids common during pregnancy?
Pregnancy is a recognized risk factor because of increased pelvic pressure and changes in bowel habits.
Do hemorrhoids cause constipation?
Constipation more commonly contributes to hemorrhoids. Painful bowel movements may indirectly worsen constipation if someone repeatedly delays defecation.
Does rectal bleeding always mean hemorrhoids?
No. Other colorectal and anal disorders can cause bleeding, so the source should not be diagnosed based on symptoms alone.[1]
How does a doctor check for hemorrhoids?
Assessment usually begins with history and inspection and may include digital rectal examination and anoscopy. Colonoscopy is used selectively when clinically indicated.
Does having hemorrhoids mean I need surgery?
No. The decision depends on the type, grade, symptoms, and response to appropriate non-surgical care.
Final Thoughts: Identify the Type Before Thinking About Treatment
Hemorrhoids are not one single condition with one appearance or one treatment.
They may be internal, external, or combined, and internal hemorrhoids range from grade I disease without prolapse to grade IV disease with persistent prolapse.
Bleeding or pain around the anus is also not enough to diagnose hemorrhoids because other anorectal and colorectal conditions can cause similar symptoms.
The correct pathway therefore starts by identifying what is actually causing the problem and what type of hemorrhoidal disease is present. Only then does the next question become relevant: does the person need simple conservative measures, an office procedure, or surgery?
Medical disclaimer: This article is intended for general health education and does not replace individualized medical assessment, particularly in the presence of rectal bleeding, severe pain, or persistent or new symptoms.
Medical References
- American Society of Colon and Rectal Surgeons — Clinical Practice Guidelines for the Management of Hemorrhoids, 2024
- American Society of Colon and Rectal Surgeons — Hemorrhoids: Expanded Information
- National Institute of Diabetes and Digestive and Kidney Diseases — Symptoms & Causes of Hemorrhoids
- National Institute of Diabetes and Digestive and Kidney Diseases — Diagnosis of Hemorrhoids
- MSD Manual — Classification of Internal Hemorrhoids
- Mayo Clinic — Hemorrhoids: Symptoms and Causes