The national disaster management office in Kiribati says it expects damaging waves will become more frequent.
The office is working to repair Betio Hospital after parts of it were destroyed by 2.9 metre tides about a week ago.
Its toilet block and maternity ward and temporary sewerage system, as well as part of a seawall built to protect the hospital, were damaged.
Michael Foon, who is with the national disaster management office, said they were working to build a higher wall before spring tides hit again.
"The sort of predictions that we have with waves reaching more than 2.9 metres, it's becoming more frequent. Last year there was only a few, but this year we're forecasting nine, and will probably see more in the future."
Mr Foon said the next spring tides were forecast to hit in a few weeks' time.