These are one of the funniest kind of jokes because the Medical profession is otherwise a serious profession.
An old woman went to see her doctor about her constipation problem.

"It's horrible," she said, "I haven't moved my bowels in a week."

"I see. Have you done anything about it?" asked the doctor.

"Yes, doctor," she replied, "I sit in the bathroom for a 20 minutes in the morning and again at night."

"No," the doctor said, `I mean do you take anything?"

"Naturally," she answered, "I take a book."