Simmons was also hospitalized previous year with dehydration, according to reports.
Richard Simmons went to the hospital Monday for "severe indigestion". according to his rep.
Catalano added that the 68-year-old is "already feeling better and is expected to make a full recovery".
Simmons reportedly was hospitalized in June after behaving strangely and becoming incoherent at his Hollywood Hills home and being admitted to Cedars-Sinai medical center for observation.
Famous for being famously healthy, Richard Simmons risks losing his shine with news that he was hospitalized for "severe indigestion".
Leicester manager blames poor refereeing for Atletico loss
As a result, I think a rested team might be put forward for this game and that will mean that the best possible performance might not be expected.
"Missing Richard Simmons", which was developed by U.S. filmmaker Dan Taberski, was released three years after the fitness personality's disappearance. The podcast, which was hosted by filmmaker Dan Taberski, delved into Simmons' whereabouts.
Simmons has not been seen in public for almost three years.
Catalano has said that Simmons just wants to take a break from fame. In an exclusive phone interview with ET in March 2016, Simmons addressed the fascination over his new private life and said, "no one should be anxious about me".
Now it appears Simmons is controlled by the male version of that TV commercial figure Irritabelle - the lady representing a stomach ache with diarrhea - in ads for Viberzi. But it was time for me to take some time to be by myself.
Simmons is also keeping busy with a new business deal that involves "merchandising, endorsements and licensing opportunities".