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Increasing pressure on the tiny veins of the anus and rectum (anorectal veins) causes hemorrhoids. Pressure in the abdomen is a primary cause. But many things can bring out or aggravate hemorrhoids including:
- Sitting or standing for long periods of time
- Constipation (which causes straining at bowel movements)
- Diarrhea
- Exertion such as lifting and coughing
- Being overweight
- Pregnancy and childbirth
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