Internal piles, also known as internal hemorrhoids, are swollen blood vessels located inside the rectum. They can develop due to increased pressure in the pelvic area, often caused by factors like chronic constipation, pregnancy, or straining during bowel movements. While they are usually painless, they can lead to discomfort and bleeding during bowel movements. Symptoms of internal piles may include bright red blood on toilet paper or in the stool, as well as a feeling of fullness or pressure in the rectal area. Treatment options range from lifestyle changes, such as increasing fiber intake, to medical procedures for more severe cases.