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Although it’s not 100% fully understood why some people get hemorrhoids and others don’t, there are some known factors that are thought to contribute to the formation of hemorrhoids. This include being overweight, aging, pregnancy, anal sex, constipation and poor diet. Basically anything that puts undo strain on the anal cavity.

Both being overweight and carry extra weight due to a pregnancy put strain on the entire body, so it’s not that big a jump in logic to think that the extra weight might constrict the anal canal, possibly making it harder to pass stools which could inflame the veins in the anal region. Plus, overweight are probably not eating a diet high in healthy high fiber foods which may cause constipation, harder stools and straining while using the bathroom, all of which are thought to contribute to having a hemroids problem. For pregnant women, constipation can also be a problem, not because of bad diet choices necessarily but just because stomach problems are common during pregnancy. Plus, fetal growth and pushing the baby through the birth canal are both putting excessive pressure on the anal canal.  

It seems that the process of aging also makes hemorrhoids more likely. This may be due to problems with irregular bowel movements or may be causes by muscle loss. As we all get older, we lose muscle; this is also true of the muscles in our anal canal. We have tissue walls which hold the veins in place in our anal canals, and its thought that perhaps as we age, these wall sag a bit which then may cause the veins to become stressed. This is basically all a hemroid is, a stressed vein.

So, although doctors aren’t exactly sure why some people get hemorrhoids and others don’t, eliminated certain risk factors like obesity and a poor diet can go a long way toward improving your odds of not getting hemorrhoids.