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It is hard to say what exactly causes hemorrhoids. In simple terms, it’s too much irritation or pressure being exerted on the veins around the anus. That pressure might be caused by several factors, including excessive straining during bowel movements, sitting on the toilet for too long, and chronic constipation or diarrhea. Other potential causes for hemorrhoids might be a low fiber diet and frequently lifting heavy objects. Hemorrhoids can also occur due to the weakening of the supporting tissue in your anus and rectum. This commonly happens as you get older and for women during pregnancy.