We say in the Amida, Hashem is רופא חולי עמו ישראל, He heals the sick of Israel.

We know Hashem is the One who heals everyone in the world,  so what is unique about us?

Rav Shlomo Zalman Auerbach explained, when Hashem decrees a sickness upon a person, it has to stay until its prescribed time to leave. But that only applies to the nations of the world. Regarding the Jews, Hashem gave us the power of tefila. We could pray to remove the sickness earlier, and  become healed way before the decreed time that the sickness was supposed to leave.

That is a gift given exclusively to us, by Hashem, because He loves us so much.

~ R’ David Ashear