Accurate Differentiation of Dyssynergic Defecation Patients from Normal Subjects Based on Abnormal Anorectal Angle in MR Defecography
Often described as "varicose veins of the anus and rectum,” hemorrhoids are enlarged, bulging blood vessels in and around the anus and lower rectum. The rectum is the bottom section of your colon (large intestine). The tissues supporting the vessels stretch. As a result, the vessels expand, the walls thin and bleeding occurs. When the stretching and pressure continue, the weakened vessels protrude. The two types of hemorrhoids, external and internal, refer to their location.
External (outside) hemorrhoids form near the anus and are covered by sensitive skin. They are usually painless unless a blood clot (thrombosis) forms.
Thrombosed external hemorrhoids are blood clots that form in an outer hemorrhoid in the anal skin. If the clots are large, they can cause significant pain. A painful anal mass may appear suddenly and get worse during the first 48 hours. The pain generally lessens over the next few days. You may notice bleeding if the skin on top opens.
Internal (inside) hemorrhoids form within the anus beneath the lining. Painless bleeding and protrusion during bowel movements are the most common symptoms. However, an internal hemorrhoid can cause severe pain if it is completely prolapsed. This means it has slid out of the anal opening and cannot be pushed back inside.
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