Frank Fritz, famous for his work on "American Pickers," is having some serious health issues ... because he's in the hospital after suffering a stroke.
Frank's condition doesn't sound too promising, with his former History channel show co-star, Mike Wolfe, asking for thoughts and prayers.
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Mike shared Frank's health update Thursday on social media, saying ... "Now is the time to pray for my friend. Frank has suffered a stroke and is in the hospital. Please keep him in your hearts and thoughts."