Mayer, who is now touring with The Dead and Company, was forced to cancel his show in New Orleans today.
The singer was sent to the hospital for an emergency appendectomy, a spokesperson for Mayer told People magazine.
Musician John Mayer was hospitalized Tuesday morning so he could undergo an emergency appendectomy, according to the band Dead & Company. He had been due to perform at a concert in New Orleans with the Dead & Company, but that date has been postponed.
The show will be rescheduled, and tickets for tonight's postponed concert will be honored at that later date.
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In addition to his shows with Dead & Company, he is set to perform in the Los Angeles area on December 30 and 31 with Dave Chappelle.
The 40-year-old guitarist has been on tour with Grateful Dead offshoot Dead & Company since early last month. "Should ticketholders choose to seek a refund, they will be available at point of purchase".
Further details about Mayer's condition are not yet known.