What causes groin pain from pull starting equipment?

Some outdoor equipment I use is a bit hard to pull the pull rope. Sometimes is snaps back and then I'll feel a dull ache in more groin on one side for the next day or two. It's very annoying. Really anytime I strain too much it can cause groin pain. What do you think causes that? It's been this way for years. Initially the doctor thought it was a hernia, but you would think after like 8 years it would have gotten worse and it really hasn't gotten worse, but still flares up a few times a year. I've had several hernia checks as a second opinion over the years and always passed. I think it's a back problem that radiates down to the groin. My back doesn't hurt though.

What causes groin pain from pull starting equipment?
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