If you have appendicitis, your appendix usually needs to be removed as soon as possible. This operation is known as an appendectomy or appendicectomy.
Surgery is usually also recommended if there's a chance you have appendicitis but it's not been possible to make a clear diagnosis.
This is because it's considered safer to remove the appendix than run the risk of the appendix bursting.
In humans, the appendix doesn't perform any important function and having it removed doesn't cause any long-term problems.