A mass of enlarged twisted veins in the mucous membranes inside or outside of the rectum is called hemorrhoids. Hemorrhoids can occur due to various factors such as straining during bowel movements, chronic constipation, pregnancy, obesity, or prolonged sitting or standing. They can cause symptoms like rectal bleeding, itching, discomfort, and pain. Treatment options for hemorrhoids range from lifestyle modifications and over-the-counter medications to medical procedures, depending on the severity and symptoms. It's always advisable to consult a healthcare professional for proper diagnosis and guidance if you suspect you have hemorrhoids.