Tickets to the shows in Nashville, Louisville, Philadelphia and Uniondale will be honoured at the new dates.
However, fans with tickets to the concerts in Charlotte, Kansas City and St Louis will receive full refunds and have to purchase new tickets, reported Ace Showbiz.
Miley Cyrus also excited fans with additional tour dates in Pittsburgh (scheduled for August 4 at Consold Energy Center) and Chicago (August 14 at United Center).
Earlier this month, the 'Wrecking Ball' hitmaker, 21, had to be admitted to a hospital following an allergic reaction to antibiotics. She was discharged from the medical centre last week.