An “-ostomy” is any surgery that creates a stoma. For a colonostomy, the stoma is formed by joining a surgical opening in the large intestine (colon) to a surgical opening in the abdomimal wall. Edges of the intestine are sutured to the edges of the abdominal opening, creating a stoma that leads to the colon (hence, a colonostomy).
Once secured, the tissues eventually fuse (like any other healing process). Once healed, there is usually no pain.
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