- "The Gift"
- "The Apprentice" (mentioned/implied)
- "The Wicked"
- "The Traitor"
- "The Advice" (mentioned)
- "The Love"
- "The Compilation"
|"The Goons"||Gumball, Anais, Rocky, Banana Joe, Idaho, and Anton||They were all injured during the Dumb Race.|
|"The Date"||Gumball||He was bitten several times by Penny's pet spider, Mr. Cuddles.|
|"The Curse"||Gumball||He fell off the Elmore Expressway bridge.|
|"Christmas"||Santa Claus, Martin Peaches, Felicity Parham, and Marvin||Santa is accidentally run over by the Wattersons; Marvin, Felicity and Martin are there for unknown reasons.|
|"The Bumpkin"||Gary||His foot was run over by the Wattersons' car.|
|"The Authority"||Richard||He fell while trying to fix the satellite dish.|
|"The Kids"||Gumball and Darwin||They went to see a doctor to fix their breaking voices.|
|"The Extras"||Hamburger Cop and Drum Kit Guy||The Hamburger Cop had high cholesterol; the Drum Kit Guy was sneezing nonstop.|
|"The Boss"||Mr. Robinson||He lost all his stuffing.|
|"The Saint"||Gumball and Darwin||They went to test serums.|
|"The Gift"||Anais||She got sick from kissing her frog Reginald.|
|"The Apprentice"||Gumball||He was knocked out by a golf ball.|
|"The Traitor"||Alan and Jessica||Alan gives one of his organs to his mother, and the transplant surgery is performed by Gumball and Darwin.|
|"The Love"||Richard||He was sent flying and landed in the hospital after the prisoners punched him.|
|"The Choices"||Nicole||She was pregnant; Gumball and Anais were born there.|
|"The Code"||Richard||He gets stuck in a lawn chair.|
|"The Test"||Tobias||He was unconscious for a few days after trying to jump a shark on water skis.|
|"The Copycats"||Richard and Chi Chi's father||Both donate their kidneys.|
- Gumball has been admitted to the hospital six times throughout the series, the most out of all the patients.
- In some episodes, a mirrored poster of the Elmore Junior High Computer Club can be seen on a lamppost.
- One of the doctors at the hospital, Dr. Butt, looks almost identical to Richard's butt. This was done to reference an event earlier in the episode he appeared in.
- The hospital has a different design in Season 5.