Piles is classified into four grades:
Grade IV piles cannot be pushed back in and need treatment. They are large and remain on the outside of the anus only.
Grade III piles are also known as prolapsed haemorrhoids and appear outside the rim. One may feel them hanging from the rectum, but they can be easily re-inserted.
Grade II piles are larger than grade I piles and are found inside the anus. They might be pushed out during the passing of stool, but they will return unaided.
Grade I where there are small inflammations inside the lining of the anus that is not visible.