Mark Nicholas' illness has forced the Channel Nine cricket commentator to take leave.
Nicholas left the MCG in an ambulance because of stomach pain on the first day of the Boxing Day Test.
After resting on day two, he returned to work on Wednesday.
But Nicholas fell ill again and had to return to hospital.
"Mark is taking leave to resolve his health issues," a Nine spokesperson said on Thursday morning.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
"He wants to thank everyone again for their kind wishes and continued support."

