Almost four out of five Americans feel stress frequently or sometimes, according to a Gallup poll released Wednesday, showing numbers not seen since just after the terrorist attacks on 9/11.

The Dec. 4-11 poll found 44 percent of people "frequently" experience stress in daily life and 35 percent reported it "sometimes." Only 17 percent said it "rarely" happens and 4 percent said they were not afflicted.

A Gallup chart indicates stress levels are higher than in December 2001, three months after the terrorist attacks. That year, 42 percent said they frequently experienced stress in daily life, two percentage points lower than results from this December.

That number dropped to 33 percent in 2003. This marks the first year Gallup has asked the question since 2007.

An earlier Gallup study from 1994 found two-in-five people faced daily stressors. It's not clear when the last time stress levels hit today's level of 44 percent.

The majority of people between the ages of 18 to 29 and 30 to 49 frequently experience stress, as well as all ages who reported an annual household income of less than $30,000.

The telephone poll was conducted among 1,049 adults nationwide and had a 4 percentage point margin of error.