Haemorrhoids, commonly known as PILES, are swollen veins in the lower rectum and anus. They can cause itching, pain, and bleeding during bowel movements. Haemorrhoids can be caused by straining during bowel movements, pregnancy, aging, and chronic constipation or diarrhea. Treatment for haemorrhoids includes lifestyle changes, such as eating a high-fiber diet and drinking plenty of fluids, as well as over-the-counter medications and medical procedures.