A representative for the Grammy-winning artist said Mayer was admitted to the hospital early morning.
As previously reported, John's medical emergency has forced his band Dead & Company to postpone the final three dates of their current tour.
However, the remaining two dates of the group's tour have been postponed.
Mayer's Dead and Co. bandmate Bob Weir posted a photo on Twitter of the pair rehearsing on stage with the note, "Wishing a speedy recovery for John..."
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The "Love on the Weekend" crooner still seems to be in good spirits despite the unfortunate circumstances, posting a mirror selfie on Instagram with the caption "still got it".
The 40-year-old had performed with the Dead & Company as recently as Sunday.
All tickets will be honored at the rescheduled dates, the info of which should be released in the coming weeks.
The Dead & Company concerts scheduled for December 7 in Orlando and December 8 in Sunrise are postponed. Information on the rescheduled concerts will be announced as soon as possible. "Should ticketholders choose to seek a refund, they will be available at point of purchase".