When Frank returned to American Pickers looking much thinner in Season 9, fans began to worry that there was something wrong with him. The buzz around Frank’s weight loss ultimately became so loud that he felt the need to address it, and explain why he was now slimmer than he’d been during earlier seasons. “A lot of you have been wondering about my health and my weight loss,” Frank wrote in 2013.

“I have an illness called Crohn’s [disease], which at times is difficult to deal with,” Frank continued. 

Frank has been battling with Crohn’s disease for more than 30 years, and in that time, he’s come to deeply understand the symptoms that come with the illness. The symptoms of Crohn’s include diarrhea, abdominal pain, reduced appetite, and bloody stool. 

“I started losing weight and ran with it!” Frank said as he explained his weight loss. “I have been exercising and eating good… Thanks for all of your kind words of concern! I couldn’t do what I do without all of you!”

Although the symptoms of Crohn’s can be quite severe, Frank has said that he’s learned how to manage them so that they don’t impact his ability to go picking. 

Source : https://www.distractify.com/p/is-frank-from-american-pickers-sick