High numbers of students are beginning college having felt depressed and overwhelmed during the previous year, according to an annual survey released on Thursday, reinforcing some experts’ concern about the emotional health of college freshmen.

The survey of more than 150,000 students nationwide, “The American Freshman: National Norms Fall 2014,” found that 9.5 percent of respondents had frequently “felt depressed” during the past year, a significant rise over the 6.1 percent reported five years ago. Those who “felt overwhelmed” by schoolwork and other commitments rose to 34.6 percent from 27.1 percent.

Conducted by the Cooperative Institutional Research Program at the University of California, Los Angeles’s Higher Education Research Institute for almost 50 years, the survey assesses hundreds of matters ranging from political views to exercise habits. It is considered one of the most comprehensive snapshots of trends among recent high school seniors and is of particular interest to people involved in mental well-being.

“It’s a public health issue,” said Dr. Anthony L. Rostain, a psychiatrist and co-chairman of a University of Pennsylvania task force on students’ emotional health. “We’re expecting more of students: There’s a sense of having to compete in a global economy, and they think they have to be on top of their game all the time. It’s no wonder they feel overwhelmed.”