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TMZ has learned the MAIN reason The Situation's father decided to launch his expletive-filled campaign against his son on the Internet yesterday ... and it all comes down to medical insurance. 
One of Frank Sorrentino's business associates tells TMZ, Frank had asked Sitch for some help making his monthly medical insurance payments recently -- and the "Jersey Shore" star flat out refused.
According to sources, The Situation not only said no -- but told his dad to "move to Florida and go on welfare."
We're told Frank was pretty adamant about repaying his son anyway -- using money from a business deal they allegedly made to develop real estate in NYC ... but the Sitch never gave him a chance.
Frank was outraged by his son's rejection -- and responded by RIPPING the Sitch into pieces online yesterday in multiple angry videos.
Sitch released a statement earlier today, saying he is "extremely saddened" by his father's actions.
The Sitch's Dad: He Wouldn't Help Pay My Medical Bills
5/11/2011 4:40 PM PDT BY TMZ STAFF
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STARR C
Fame Whore!
David
They're both ghetto. Like father like son.
SonofZeus
Hey, Sitch...in some states adult children are on the hook to repay their parents Medicaid benefits.
Scott
On the upside genetics is a btch. Stich take a look in the mirror cause you too will look like an old beaver one day, if you live that long cough cough skin cancer, aids ahemmmmmmm.
Pooooty
Looks like Dad has a big belly..Now that's a Situation.
Alli
Now we know his dad just asked for a temp loan to pay his family medical health insurance for the month. Why on earth would his son say no. He has the money. If someone was there for you, your whole life than damn right they should be able to ask for help and expect their son to say NP.... IMO
Scott
Again on the upside dear ole dad made enough off his rants to cover whatever debts he had, that is for now.......
Mark Proctor
Shame on Sitch. You only have family and if you lose your insurance; try to get coverage. And once you lose it; the new insurance will not cover pre-existing conditions. The kid should be ashamed of himself.
Gingern
Emulating Michael Lohan: BAD IDEA. :/
Puckett
"Sitch released a statement earlier today, saying he is "extremely saddened" by his father's actions."
Yeah and i'm extremely saddened that talentless douchbags like you are now getting paid a small fortune, simply being the guido douchebag that you are. Can't wait till you've blow it all and people tell you to f*ck off too, go collect welfare.
This dude is going to be so f*cking broke in 5 years and nobody is going to give a f*ck who he is by then. :)
Mary
Well we see now where he gets his good looks. I hope you can hear the sarcasm oozing out of my comment. They are both a piece of work. Who cares what either have to say.
MP
Frankly, they both seem like dirtbags.
AH
He probably already spent all his money on cars with the way he goes through them.
Quinn
His Dad isn't telling the whole story. There's more to it than he's letting on.
Loni1082
I think what the father is going is wrong! However, That's his father!! If that was me I would help my father out with his medical bills if I had the money to do so. I think the situation is being very greedy to his father. That is his own flesh and blood. But, The father could have gone about it in a different way instead of putting him on blast.