Smith, 22, had to cancel a series of Australian shows in April after suffering a haemorrhage on his vocal cords while performing in Sydney.
The singer said yesterday that he will not have to get surgery.
"Dear all: I am very upset to announce I have been battling to get my vocal cords better the last 10 days but unfortunately they haven't recovered and I am going to need surgery," Smith wrote on his Instagram page.
"I am so gutted to be missing all the shows and events I was meant to be playing at. The doctors say I will be back 6-8 weeks and I cannot wait to sing for you all soon," the 'Stay With Me' hitmaker wrote.