The Expendables 2 star - who has a degree in chemical engineering - told The Huffington Post that he considered other careers when acting work dried up in the 1990s.
"I didn't think of becoming a chemical engineer again, but I was stroking the idea of trying something else," Lundgren explained. "You know, I had an offer to run for office in Sweden, believe it or not, for the parliament for one of the parties - and I didn't want to do that because I didn't want to move back to Sweden full time."
He continued: "I thought about other things, you know, business and stuff. I moved back to Europe for ten years because my kids - my wife didn't like LA at all, didn't want to live here. She went to New York, then London and Spain.
"Now that my kids are old enough... we got divorced anyway and I like LA and my new girlfriend likes it here, so I'm back here and I'm back in the acting business. But I did think, for a while, to try other things. Nothing worked out though."
Lundgren also revealed that he relied on his chemical engineering background for an Expendables 2 scene where his character Gunnar makes a bomb.
"I had to look it up, though, a little bit, on the internet. Because specifically what I was talking about, I had to look it up a little bit. But, yeah, it comes back fairly quickly," he commented.
"I mean, I've been on talk shows and sometimes they try to throw me a few questions to see if there's any truth to it. And usually I get most of them fairly close - maybe I miss one or two. But it kind of comes back, you know?"
The Expendables 2 - which also stars Bruce Willis, Arnold Schwarzenegger, Jason Statham and Sylvester Stallone - is now playing in the UK and opens on Friday (August 17) in the US.
Watch the trailer for The Expendables 2 below: