Hemorrhoids, also known as piles, are swollen veins in the lower part of the anus and rectum. They occur when the veins surrounding the anus are engorged or enlarged. Common causes include pregnancy, aging, diarrhea, chronic constipation, sitting or standing for long periods, heavy lifting, anal intercourse, obesity, and genetics. Symptoms include painless bleeding, itching or irritation in the anal area, discomfort, pain, or soreness. Diagnosis is made by a doctor based on symptoms. Treatment options range from simple measures like lifestyle changes to medicines or surgery depending on severity.