IN THIS ARTICLE
What is the difference between an internal, external, or thrombosed hemorrhoid?
What causes hemorrhoids?
Patient Comments Read 3 Comments
Hemorrhoids are not arteries or veins, but instead are normal blood vessels called sinusoids that are located in the walls that surround the rectum and anus. When the venous pressure within these blood vessels increases, the hemorrhoids swell and dilate, because it is more difficult for blood to empty from them. This leads to the most common symptoms of bleeding and swelling.
Common situations that increase pressure within the hemorrhoidal blood vessels and lead to abnormalities include the following.
Medically Reviewed by a Doctor on 6/6/2016
Bhupinder Anand, MD
YOU MAY ALSO LIKE
Must Read Articles Related to Hemorrhoids
Patient Comments & Reviews
The eMedicineHealth doctors ask about Hemorrhoids:
Hemorrhoids - Surgery
Did you need surgery for your hemorrhoids? Please describe the experience.
Hemorrhoids - Causes
Do you sit too much? Not enough fiber in your diet? Please discuss the reason for your hemorrhoids.
Hemorrhoids - Symptoms
What are your hemorrhoid symptoms?
Hemorrhoids - Effective Treatments
What kinds of treatments have been effective for your hemorrhoids?
- Should You Have Surgery?
- Understand Your Treatment Options for Constipation
- 19 Habits That Wreck Your Teeth