- "The Gift"
- "The Apprentice" (mentioned/implied)
- "The Wicked"
- "The Traitor"
- "The Advice" (mentioned)
- "The Love"
- "The Compilation"
- Dr. Butt
- Bandage Doctor
- Bandage Paramedics
- Old Doctor
- Twitchy Scientist (formerly)
- Teri’s mother
- Doctor Man
- Harold’s Employer
|"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, Tony, Felicity, and Marvin||Santa is accidentally run over by the Wattersons; Marvin, Felicity and Tony 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.|
|"The Nuisance"||Gumball||He tried to stop bullying but failed.|
|"The One"||Gumball||Flashback to when he had a broken leg and received get well cards.|
|"The Cringe"||Gumball and Hot Dog Guy||They get hospitalized due to cringe overdose.|
|"The Brain"||Anais||She got brain damage due to facepalming too much.|
|"The Parents"||Mary||She was pregnant; Nicole was born there.|
- Gumball has been admitted to the hospital nine 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 (and the hospital as a whole) debuted in, "The Goons".
- The hospital has a different design in Seasons 5 and 6.
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