By comparison, 9 percent of all Americans are estimated to suffer from depression, according to a study released last year by the U.S. Centers for Disease Control and Prevention in Atlanta.

The survey was conducted online with about 400 respondents, most of who cared for an ill parent while the rest cared for a spouse, relative or friend.

Many of the respondents also reported that they were also facing their own health issues even as they were caring for their loved ones.

The survey also found that a third of family caregivers spend more than 30 hours a week in that role, and 77 percent are concerned about the impact of their duties on their savings.

Depression is one of the signs of caregiver burnout. Providing care to someone who is ill can be deeply satisfying, but it can also be overwhelming. The strain of balancing a job, a family, more work in the home, and the care of someone can make you tired, frustrated, angry and may even make you sick if not handled properly.

Following a strategy to cope with caregiver burnout is a recommended practice for every caregiver.