That varies so much as to be a meaningless question. Some people have loans that include undergraduate education. Some get additional loans to cover living expenses while others do not. And cost of education varies from under $10000 per year to over $50000 (just for tuition) in med school.
You ask a lot of really random and seemingly unrelated questions. I am trying to figure out why you would be asking this question in conjunction with asking so much about hemepath.