Australian Olympic gold medallist Chelsea Hodges has made the heartbreaking decision to retire from the sport aged just 22.

The Biloela-born breaststroke swimmer said "there simply weren't enough breaststroke kicks left in me", opting to pull out of next month's Olympic trials in order to prioritise her future health.

Hodges, who has suffered from multiple hip injuries in her career, said it was not worth rolling the dice for one more shot at Olympic glory in Paris, crediting her doctor John Ward with being honest enough to tell her "the hard truth".

"I had my first hip operation at 15 … and another one last year," Hodges told Swimming Australia.

"I wanted one last chance at the Games but after six cortisone injections, I had to make a decision on my future."

The 22-year-old won gold in the all-conquering 4x100m medley relay team in Tokyo, alongside Australian swimming royalty Emma McKeon, Kaylee McKeown and Cate Campbell.

Hodges's swim in the final was described as "phenomenal" by head coach Rohan Taylor, limiting her time losses to America's individual 100m breaststroke champion Lydia Jacoby to put the Aussies in a position to win gold and break the Olympic Record.

"Chelsea's swim in that final was phenomenal … and it contributed to the team being able to take the gold medal," Taylor said.

"She persevered for so long to make Paris possible, and she went so close, so it is with mixed emotions that I congratulate Chelsea on her wonderful career."