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Many chaplains work in hospitals, police departments, fire departments or in the military, where lives regularly hang in the balance.
"What's wonderful about this job is walking alongside those who are most vulnerable and helping them find their own spirituality and strength," said John Polk, director of chaplaincy for Massachusetts General Hospital.
But then there's also the pressure of dealing with the everyday grief and trauma. Hospital chaplains, for example, often deal with severe injuries or deaths and the stress can really build up.
Then there are patients with long-term chronic conditions that chaplains often must see die.
Polk worked with heart transplant patients who sometimes waited for months in the hospital for a match that never came. Their deaths were particularly wrenching, he said.