Brian Austin Green has more on his plate than his beef with Machine Gun Kelly … the actor is currently recovering after undergoing surgery for a perforated appendix.

The “Beverly Hills, 90210” star revealed on Instagram Monday he was hospitalized after experiencing stomach pain. Turns out he got checked out just in time — after visiting several emergency rooms, he learned his appendix was “not quite burst, but just before.”

Brian says he received immediate care at Providence Cedars-Sinai in the L.A. area and had high praise for the hospital, noting … “The aftercare was phenomenal. I mean, when I tell you every single person that was there was incredibly kind and loving and supportive and helpful, I mean it.”

His hospitalization comes just weeks after his ex, Megan Fox, welcomed her first child with Machine Gun Kelly.

Brian and MGK were caught in a bitter back-and-forth before the baby girl was born … with Brian telling the singer to “grow up” following his split from Megan, and MGK taking a swipe at Brian by creating an all-green drink at his 27 Club Coffee.