Hemorrhoids are common in pregnancy. First, in preparation for delivery your whole pelvic area is being engorged with blood and tissue fluid. This makes gentler passage for the baby, and also protects your birth canal during delivery. Secondly, constipation is common in pregnancy, causing you to strain more while having a bowel movement. The combination of increased blood supply to your pelvic area and straining leads to hemorrhoids.
You can reduce your odds of contracting hemorrhoids by relieving the constipation. Make sure you drink plenty of fluids, 5 glasses of water and 3 glasses of milk a day. Eat a diet relatively high in fiber. Look for cereals that have 6 grams of fiber or more per serving. Consider taking a fiber supplement; eat lots of fruits and vegetables. All this will make elimination of your stool easier and reduce your risk of hemorrhoids.