Unknown devices in iPhone Health app

Okay, I kinda found a solution while fixing an unrelated issue with the Health app being slow, but many of you may not like it: it nukes your health data. But maybe somewhere in these steps I did might fix it.

what I did:

1. Went to Settings>iCloud Account>Health and turned off “Sync this iPhone (or iPad) for all my devices. Selected “Turn Off”. Selected “Delete from My iPhone (iPad)”. This is where you can try to save your health data by selecting “Keep on My iPhone (iPad)”.
2. Tapped “Manage Storage” and tapped “Delete Data From iCloud”
3. Restarted each device to be on the safe side.
4. re-enabled “Sync this iPhone (iPad)” on each device and I went into the Health app and noticed all the ghosts were gone.

Now I did this on all my devices that synced the Health app to iCloud, including my iPad. Hopefully y’all can figure out how to do this without going to the extreme of nuking your health data. Make sure you do steps 1-3 on all your devices before doing step 4.

I yesterday I paired a new Apple Watch Ultra 2 (watchOS 18) with my iPhone 14 Pro (iOS 18) and experience the very same. Many 'ghost' devices with the generic names 'iPhone' and 'Apple Watch' are generated.

So not only the Apple Watch, iPhone and my iPad are listed as Device/Source but also a zillion time 'iPhone" and 'Apple Watch'.

You can see the long list (it is actually growing) displayed here:

iPhone/Settings/Apps/Health App/Data Access & Devices/Devices

iPhone: Health App/Profile/Devices

I have contacted Apple Support and they advised me to turn off and toggle Health sync in iCloud settings on both my iPad and iPhone but that was not the solution.

Apple Support will call me back next week.

PS this list with devices/sources is buried deep in the Apple settings so normally people don't even see it...

A last update of today. Apple Support called me and confirmed me that this is issue is known and they are working on it.

At this moment it is not sure when it is solved or with which iOS 18 update...

Not really as these ghost device names ‘Apple Watch’ and ‘iPhone’ contain no data. Since I paired the new Apple Watch yesterday about 44 ‘Apple Watch’ devices have been added

all data recorded is listed in the correct devices with their specific device names

I’ve noticed this too. My health app has been extremely slow/crashing across my devices and I went to delete some of the data and noticed this long list of ghost devices. List varies depending on the device, but they are listed as “iPhone”.

this screenshot is only a portion of the list. It even duplicated my actual iPhone once, as you can see.

Thank you very much for your solution.

yet het is not clear to me if All your health data is gone or Stil Available?

Again, I like to State that this setting/data is buried deep in de iOS en man people don’t even notice the issue.

It looks like we are not the only ones affected, I am sure that in this case the issue is caused by a bug in iOs 18.0.

Tomorrow, I have a call with AppleCare and Will See what they will come with..

I keep you All posted

It appears to simply be a recording of data for a day and where that data was recorded from.

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I notice this also, I would like to know the cause.