The number of Americans who have taken part-time gigs on top of their full-time jobs rose 6% in October to 4.5 million, according to the Labor Department.

Their main reason is red-hot inflation of 8.2% has given them unpleasant surprises in the form of, for example, a sudden $500 increase in their monthly rent or tripled gas prices at the pump, The Wall Street Journal reports.

Nearly 75% of workers say they need the additional work to earn enough income because of inflation, according to a Monster.com survey of 1,700 U.S. workers. Eighty-one percent of Gen Z and 77% of Millennials have either taken a gig job or are considering doing so, according to a Prudential Financial survey of 4,700.

One such individual, 25-year-old Meredith Shields, is supplementing her position as a project manager at a distribution company with a second job at T.J. Maxx unloading trucks, folding clothes and selling on the floor.

The $100 to $300 extra income each week “definitely helps because I did have a lot of anxiety about finances, and I hate asking for help,” explains Shields, who lives in Charleston, South Carolina. “It was pretty much kind of a paycheck-to-paycheck sort of living, and, now, with the second job, it’s definitely a lot more comfortable.”

Another person juggling two jobs is Antonio Torres, a 29-year-old asphalt paver who took a weekend job three weeks ago as a line cook and a dishwasher at a chain restaurant. Working 12 hours every Saturday and Sunday nets Torres an extra $200 a week.

Torres says the extra hours leaves him little time to spend with his wife but “I had to do what I had to do to not fall behind. I want to work hard to get a little extra cash so we can save to do more things.”

It isn’t just blue-collar workers who are taking second jobs, either. Staffing firm Kelly Services Inc. says one in every 30 people seeking a second job are in professional services. In previous years, it was one in every 100.

Onema Stewart, a 47-year-old associate recruiter at Korn Ferry, augments that work with an evening and weekend job as a Home Depot sales associate. Her husband, a retired teacher in his 60s, is now doing maintenance work at a Buc-ee’s convenience store.

Stewart says her family needs the extra money because of rising grocery and gas prices, as well as to help pay for their 18-year-old son’s college.

As Stewart puts it, “I’m grateful that I’m still young enough and fit enough to be able to do what I’ve got to, to make sure my family still has the things that they need—but at the same time, I’m kind of resentful a little bit that I have to do that.”