Solve. What does this joke mean?

Seeing the waiter always touching his ass, the doctor asked him if he had hemorrhoids, just as the doctor cared about the patient.

The waiter thought the doctor ordered a dish called "hemorrhoids" and asked him to order the dishes on the menu.

In other words, there is no so-called "hemorrhoids" in their restaurant. In fact, the waiter didn't understand what the doctor really meant.