JoJo Siwa bounced back like a "Boomerang" after a scary medical incident landed her in the hospital ... still hitting the stage despite a burst cyst.

The singer and dancer broke it down on TikTok ... revealing she was having trouble breathing and dealing with excruciating pain ahead of her show at the Mall of America on Friday. Instagram / @jessalynnsiwa

In the clip, Siwa says her mom, Jessalynn , had to help her get dressed before she was transported to a local hospital in Minnesota by ambulance.

Siwa says she told doctors she would listen to their advice ... but, she had a ton of fans waiting for her, and she hoped they could treat her and still get her to the performance. Gallery Launch Gallery Getty

Doctors performed an ultrasound, Siwa says ... and, they found an ova

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