usually caused by increased pressure on the veins in the pelvic and rectal
area. As pressure increases, blood pools in veins and causes them to swell.
Eventually, the swollen veins stretch the surrounding tissue, and hemorrhoids
Bowel habits that can cause increased pressure and lead
to hemorrhoids include:
Hemorrhoids may or may not cause symptoms. Symptoms may include:
Pain and discomfort around the anus.
Moist, pink pads of skin protruding from the anus; sometimes they may appear purple or blue.
Bleeding from the anus.
Rushing to complete a bowel movement. Hurrying
can lead to excessive straining and can increase pressure on rectal
Persistent diarrhea or constipation, which may cause
straining and increase pressure on veins in the anal canal.
Other things that can lead to the development of
Being overweight. Excess weight, especially in
the abdomen and pelvis, may increase pressure on pelvic
Pregnancy and labor. Hormonal changes during pregnancy
increase blood flow to the pelvis and relax supportive tissues while the
growing fetus causes increased pressure on blood vessels. During labor,
hemorrhoids may develop because of the intense pressure on the anal area while
pushing to deliver the baby.
Medical conditions. For example,
long-term heart and liver disease may cause blood to pool in the abdomen and
pelvic area, enlarging the veins.
In this article
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Medical Reference from Healthwise
November 14, 2014
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this