Several factors contribute to the formation of piles. These include:
- Lack of proper toilet training.
- Chronic constipation and excessive straining during bowel movements. "Spending long period of time (e.g. reading) in the toilet.
- Pregnancy.
These factors cause the tissues supporting the blood vessels of those vascular cushions to stretch and break. As a result. the blood vessels enlarge; their walls become thinned out and bleed. With further stretching, the anal cushions enlarge and protrude causing discomfort and bleeding.