Health Connect not syncing: 7 fixes that work (2026)

90% of Health Connect not syncing problems have a simple cause: missing permissions or battery optimization killing background sync. This guide follows the correct diagnostic order, from the most to least frequent problem, so you can fix it in 5 minutes without reinstalling anything.

First: identify the exact symptom

• •Data never present: the reading app has never received data from Health Connect. Problem: permissions or source app not connected.
• •Data present but delayed (hours/days): sync not real-time. Problem: battery optimization, background sync disabled.
• •Partial data: some metrics yes, others no. Problem: granular permissions missing for specific data types.
• •Duplicate data: same metric appears twice. Problem: multiple sources writing the same type (e.g. Garmin + Samsung Health).
• •Historical gap: data missing for a specific period. Problem: app not connected during that period, or crash.

Fix 1: Check permissions in Health Connect

1. Open Health Connect (search in app drawer or search 'Health Connect' in settings).
2. Go to App permissions.
3. Find the app that's not syncing (e.g. FitMesh Sync, Garmin Connect, Samsung Health).
4. Tap the app → verify it has read and write permissions for all data types you expect (Steps, Heart Rate, Sleep, Workouts).
5. If permissions are missing, enable → grant.

Fix 2: Disable battery optimization for the apps involved

Android's battery optimization is the silent killer of background sync. When Android puts an app into deep sleep, it can't read or write to Health Connect. The fix: exclude both the source app (Samsung Health, Garmin Connect) and the reading app from optimization.

1. Settings → Battery → Battery optimization (or 'Power saving' on Samsung).
2. Search for the app (Samsung Health, Garmin Connect, or any other app involved).
3. Select Don't optimize (or on Samsung: tap app name → 'Unrestricted').
4. Repeat for every app in the sync chain.

Fix 3: Force sync from the source app

Many apps (Samsung Health, Garmin Connect, Fitbit) don't write to Health Connect in real-time: they do it at intervals or when opened. Manually opening the app and letting it update is often enough.

• •Samsung Health: open the app, go to the main screen. Pull down to refresh. Then go to Settings → Health Connect → verify 'Sync with Health Connect' is enabled.
• •Garmin Connect: open the app. Garmin writes to HC after each watch sync. Check Garmin Connect → Settings → Health Connect → Health Connect enabled.
• •Fitbit: open the app → wait for it to sync with the device. Fitbit writes to HC after each successful sync.

Fix 4: Clear Health Connect cache

1. Settings → Apps → find Health Connect (may be under 'All apps').
2. Tap Storage & cache.
3. Tap Clear cache (NOT 'Clear data').
4. Reopen Health Connect and let it reinitialize.

Fix 5 (Samsung): direct Samsung Health → Health Connect connection

On Samsung devices, Samsung Health has its own dedicated pipeline to Health Connect, separate from normal background sync. If this pipeline is broken, the fix is to disconnect and reconnect:

1. Open Samsung Health → tap three dots top-right → Settings.
2. Scroll to Health Connect → tap.
3. Disable the connection → re-enable after 10 seconds.
4. Verify all data types are selected (Steps, Heart Rate, Sleep, etc.).
5. Go back to Samsung Health main screen and wait 1-2 minutes.

Fix 6: Update Health Connect to the latest version

Health Connect updates via Play Store like any other app. Older versions have known sync bugs, particularly with intraday data and sleep segments. Updating silently fixes many issues.

1. Open Play Store → tap your profile icon → Manage apps & device.
2. Search for Health Connect and update if available.
3. Do the same for Samsung Health, Garmin Connect, or any other app in your sync chain.

Fix 7: Revoke and re-grant all permissions (full reset)

If none of the other fixes worked, the problem may be in a corrupted permission state. The solution is a full connection reset:

1. In Health Connect → App permissions → find the problematic app.
2. Tap the app → Remove access.
3. Reopen the problematic app → find the Health Connect section in settings.
4. Tap 'Connect to Health Connect' or equivalent → grant all permissions again.
5. Wait 5-10 minutes for the first sync.

When the problem isn't on your phone

If you've tried all the fixes above and the problem persists, it might be a server-side outage of the source app (Samsung Health, Garmin Connect) or a bug in your specific Android version. In that case:

• •Search Reddit (r/GalaxyWatch, r/AndroidHealth) if others have the same problem: a pattern often emerges.
• •Check the source app's status page if available.
• •Report the bug via app feedback.
• •As a temporary workaround, data accumulates locally in Health Connect: it's not lost, just not synced to cloud.

In summary

• •90% of sync problems are solved by three actions: check permissions in Health Connect, disable battery optimization for the apps involved, force-open the source app.
• •On Samsung, the specific fix is disconnecting and reconnecting the Samsung Health → Health Connect pipeline from Samsung Health settings.
• •Clearing Health Connect cache does not delete your data: it's safe to do and often fixes corrupted state errors.
• •If data is delayed but not absent, the problem is almost always battery optimization blocking background sync.
• •Unsynced data accumulates locally in Health Connect: once the problem is resolved, backfill happens automatically.