Justin Timberlake fans in New York were probably super bummed this week when the singer was forced to postpone his Wednesday night show at Madison Square Garden due to what his team called “severely bruised vocal cords.” And while the singer quickly promised to make it up to them when he returns to NYC on his birthday next year, Jan. 31, the news about his vocal injury was concerning.

To find out what this setback could mean for the rest of Timberlake’s Man of the Woods tour, Billboard reached out to esteemed laryngeal surgeon Dr. Steven Zeitels, the Eugene B. Casey professor of laryngeal surgery at Harvard best known for his career-saving vocal surgeries on Adele, Steven Tyler and Sam Smith, among many others.

First off, Zeitels — who has no first-hand knowledge of Timberlake’s case but was speaking in more general terms about vocal bleeding — says he would not use the phrase “severely bruised” to describe possible damage to vocal cords. “My presumption when I hear that is that he had a substantial amount of vocal use, presumably because he’s on tour, and maybe he had a cold or some other event, so the ‘bruising’ could refer to bleeding in his vocal cords,” says Zeitels.

In a case like this, Zeitels would counsel a client to go on immediate, complete vocal rest and cancel shows, because if you have bleeding or ruptures in blood vessels in your vocal cords, the more you use your voice, the more damage you could cause. “This is not a situation that will solve itself,” he says. “When blood goes to the vocal membranes, they don’t vibrate properly.”

Depending on the amount of damage, Zeitels says that a week or two of vocal rest is the recommended course of action in order to let the cords heal, at which point an artist could resume touring; at press time a spokesperson for Timberlake tells Billboard that in addition to the postponed Wednesday show in New York, an upcoming gig at the KeyBank Center in Buffalo, New York, on Sunday (Oct. 28) has been rescheduled for Dec. 19 and a Pepsi Center show in Denver originally scheduled for Jan. 29 has been moved up a day to Jan. 28 due to the new date for the MSG gig. Tickets for the previously scheduled events will be honored on the new dates. The spokesperson did not provide any additional information on Timberlake’s vocal injury.