‘Bachelorette’ star diagnosed with rare neurological disorder

J.P. Rosenbaum, who met and married Ashley Herbert via season 7 of “The Bachelorette,” was diagnosed with Guillain-Barre syndrome. Dr. Jennifer Ashton talks about the condition and treatment.
3:54 | 12/11/19

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Transcript for ‘Bachelorette’ star diagnosed with rare neurological disorder
The latest on former star J.P. Rosenbaum's health battle. The contestant who married Ashley after meeting on the seventh season of the show has been diagnosed with a rare neurological disorder and, Amy, are you going to tell us about it. Good morning. The father of two has just been released from the hospital but he says there's a lot of work ahead and he could be facing a long road to recovery. Hey, handsome. Reporter: He was the last man standing in season seven of "The bachelorette." So in love with you. You're the one. You've it. Reporter: The construction manager winning the heart of Ashley. Ashley, will you marry me? Yes. Reporter: But now J.P. Rosenbaum's story has taken a serious turn. Announcing on his Instagram this weekend that he's been diagnosed with guillain-barre syndrome, a neurological disorder where the immune system attack nerves usually in your arms and leg muscles. Rosenbaum speaking out from his hospital bed on a series of Instagram story clips. So guillain-barre syndrome, still not sure that's how you pronounce it. I'm working on it but very surreal and humbling and crazy things you do every day like picking up this phone or buttoning buttons, tying shoelaces you can't do it. Reporter: Guillain-barre is a rare disorder and symptoms can go from mild weakness to extreme paralysis. While he didn't go into detail he says he will need physical therapy. Hopefully plateaued and not gotten any worse and hopefully I'm on the road to recovery. I've heard from a lot of people and I know that things can get a lot, lot worse and so knock wood, hopefully that is not the case for me. Reporter: On Tuesday he said he was being discharged from the hospital and posted this from home. His daughter helping him with recovery and smiles. Am I okay? You're done? I'm done? Reporter: Rosenbaum says he is, quote, fortunate enough where we caught it early enough to start treatment early enough where key can start recovery and wish him the best. We do. Thank you. Dr. Jennifer Ashton is here. Tell us more about gbs. Six cases per million and most of the time we think of it as what's call ascending paralysis or weakness that starts in the lower extremity and works its way up and most but not all cases of guillain-barre involve demilization. Our immune system attacks it and it can suffer damage. The good news it's rare. This is very scary. Can it be confused with other conditions. Yes, something we work on, a differenten shall diagnosis so a host of other conditions that can cause weakness and afm which has been in the news a lot, botulism poisoning, my thein Ya graph advice, metabolic problems. Ms. Mostly it's made with a spinal tap. What is the prognosis and treatment. Most will get a return of their function. 80% independently. To be clear, physical therapy, rehab is the mainstay and it can take months to get a full return to function. Normally we treat it with ivig which is kind of dampens the immune system's attack on the nerves but great opportunity to learn about something. Good for him to speak out. Absolutely and most people have never heard of this. Most will never have to deal with it but great opportunity to increase awareness. Michael. All right, thank you. Now to that vegan influencer

This transcript has been automatically generated and may not be 100% accurate.

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