The number of patients admitted for routine treatment in hospitals in England was down 67% in June compared with the same time last year, NHS figures show.
The number of people going to accident and emergency units in England in July was also down on last year, by 30%.
The coronavirus pandemic has caused disruption to many areas of the health service.
But patients are being urged to seek help from the NHS when they need it.
Meanwhile, the number of people going to their GP with symptoms of cancer and being urgently referred to a specialist is rising but still nearly 20% lower than the same time last year.