Health App

Did you search for the app?

Use Search on your iPhone, iPad, or iPod touch - Apple Support

Have you disabled it in Screen Time? Settings>Screen Time>Content & Privacy Restrictions.

Health is not one of the apps you can delete. Therefore, it has to be on your phone somewhere.

Hello.

Did you delete the app?

Then, you can download it back from the App Store.

You also may accidentally moved it a folder. Search for the app song Spotlight. It will show you the location.