Elisha Bokman Source: Elisha Bokman

Elisha Bokman has been out of school for eight years. Still, her student loan balance is half a million dollars. Today, for her doctorate degree in naturopathic medicine and master's in acupuncture from Bastyr University, she owes $499,322.69. She and her husband struggled to buy a house because of her debt. Eventually, the financial stress led them to a divorce. "He felt like he couldn't live his life or do the things he wanted to do," Bokman, 38, said. She wanted to open her own medical practice, but she said her student debt prevents her from getting a business loan. "It really effects the remainder of your life," Bokman said. "There's no out."

The average college graduate leaves school $30,000 in the red today, up from $10,000 in the 1990s. Yet much larger balances are becoming more common. Around 178,000 graduate students owed more than $100,000 in the 2015-2016 academic year, up from 51,000 in 2003-2004, according to Mark Kantrowitz, the publisher of SavingForCollege.com. In the first quarter of 2019, over 6% of all student loan borrowers owed more than $100,000, up from 5.4% in 2017. Recently, Democratic presidential candidates Elizabeth Warren and Bernie Sanders have proposed forgiving student debt. Warren's plan would reduce people's tabs by up to $50,000, whereas Sanders' would erase it all. Rebecca Grable loves her job as a pharmacy manager at Walgreens. But to study at the University of Oklahoma to become a doctor of pharmacy, she borrowed more than $310,000, and said the debt has limited her options. A few years ago, when she tried to buy a car, she said, more than 11 banks denied her a loan. "I feel like I'm stuck under it," Grable, 27, said. Balancing other bills is a challenge. "I just never imagined being a professional who still lives paycheck to paycheck," she said. Bokman's and Grable's financial records were reviewed by CNBC.

Rebecca Grable, a pharmacist, owes more than $350,000 in student loans. Source: Rebecca Grable