A visit to the doctor

A young woman said to her doctor, "You have to help me, I hurt all over."

"What do you mean?" said the doctor. 

The woman touched her right knee with her index finger and yelled, 
"Ow, that hurts."

Then she touched her left cheek and again yelled, "Ouch! That hurts, too."

Then she touched her right earlobe. "Ow, even THAT hurts." 

The doctor asked the woman, "Are you a natural blonde?" 

"Why, yes," she said.

"I thought so," said the doctor. "You have a sprained finger."