Causes
Hemorrhoids are caused by repeated or constant pressure on the rectal or
anal veins. The most common cause of pressure usually results from sitting
or straining during a bowel movement. Other factors that increase the risk for
getting hemorrhoids include constipation, lifting heavy objects, poor posture,
prolonged sitting, eating a diet low in fiber, and being overweight. Liver damage
and some food allergies can also add stress to the rectal veins.