Patrick said his treatment plan has involved rest, medication and lifestyle changes he wouldn't specify.
"I'm not going to get into too much detail but there's obviously a lot of things that I've had to change," he said. "Obviously it's an annoying process."
He said his teammates have helped in that process, notably veteran forward Chris Stewart, who was on the ice with Patrick on Tuesday.
"My teammates have been amazing through it," Patrick said. "Everyone's super supportive. It's a tough thing to go through, you're kind of by yourself for a lot of it. My teammates are doing a great job make me feel part of the team."
Flyers coach Alain Vigneault has kept his focus on the healthy players, but said he's paid a bit more attention to Patrick's status recently.
"He is progressing, he is doing more off-ice workouts and he is skating a little bit more on his own," Vigneault said. "Hopefully that's a positive sign. That's all I can really tell you. I don't know much more than that."
Patrick, the No. 2 pick in the 2017 NHL Draft, had 31 points (13 goals, 18 assists) in 72 games last season, and has 61 points (26 goals, 35 assists) in 145 games in two seasons.
After the acquisition of Kevin Hayes in June, it was expected that Patrick would start the season as the third-line center, behind Sean Couturier and Hayes. Instead he's working out on his own, trying to stay positive and hoping he continues to string together good days.
"Just taking it day at a time, hopefully get back soon," he said. "But there's no real timeline so it's tough to say."