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STOCKTON - A new survey shows millions of Americans just keep on working while ill instead of staying home sick.

The public health company NSF International found a one-quarter of U.S. workers go to work while sick, while a third wait until their symptoms are serious before using sick days.

The largest reason for that trend is the pressure to get the job done.

"I think with the current demand of jobs, and everyone is slammed with different responsibilities, people feel pressured to get things done," Janelle Nelson with Stockton's Sass Public Relations said.

Nelson said she has no problem staying away from the office while sick and her boss offers a generous 12 sick days a year for full time employees. But she understands why so many others keep on working.

The survey found the second biggest reason for going to work sick is money. Forty million Americans aren't offered paid sick time so they work while ill to avoid losing money.