These are one of the funniest kind of jokes because the Medical profession is otherwise a serious profession.
When a physician remarked on a new patient's extraordinarily ruddy complexion, he said, "High blood pressure, Doc. It comes from my family."

"Your mother's side or your father's?" the doctor asked.

"Neither," he replied. "It's from my wife's family."

"Oh, come now," the doctor said. "How could your wife's family give you high blood pressure?"

He sighed, "You oughta meet 'em sometime, Doc!"