If the Bluetooth switch itself is missing from Settings or Quick Settings, this is different from a headset or mouse that simply will not connect.
Microsoft says the Bluetooth icon or toggle can disappear or become unavailable when Windows cannot detect or enable the PC's Bluetooth hardware. Possible causes include settings, drivers, system services, hardware problems, or a recent Windows update. [R1]
The useful first question is therefore:
Can Windows still see the Bluetooth adapter?
Check Airplane mode first
Open Quick Settings with Windows + A and make sure Airplane mode is off.
Microsoft notes that Airplane mode disables Bluetooth. [R1]
If turning Airplane mode off restores Bluetooth, there is no reason to reinstall drivers or change deeper system settings.
Check whether Windows can see the Bluetooth adapter
Open Device Manager and look for Bluetooth.
If the Bluetooth category and adapter are present, Windows still detects the hardware. The problem is then more likely to involve the adapter's state, its driver, or Windows' Bluetooth configuration.
If Bluetooth is missing from Settings, Microsoft notes that either the PC may not have a Bluetooth adapter or the adapter's driver may not be installed. [R2]
For a PC that definitely had working Bluetooth before, a suddenly missing adapter is therefore important evidence. It should not be treated as a normal pairing problem.
Restart the PC before deeper changes
Microsoft recommends powering the PC off and back on when Bluetooth disappears. [R1]
This can clear a temporary device or firmware state. After Windows starts again, check whether the Bluetooth toggle has returned and whether the adapter is visible in Device Manager.
A successful restart is useful only if Bluetooth actually becomes usable again.
Check Windows Update and the Bluetooth driver
Bluetooth drivers can be delivered through Windows Update. Microsoft recommends checking Windows Update when Bluetooth disappears. [R1]
If the Bluetooth adapter is visible in Device Manager, the driver can also be updated there. If updating does not help, Microsoft documents uninstalling the Bluetooth adapter and restarting the PC so Windows can reinstall its driver. [R3]
Do not install unrelated drivers simply because they are newer. Work on the Bluetooth adapter that is connected to this incident.
What if Bluetooth disappeared after an update?
If Bluetooth worked before a recent driver or Windows update, the timing is relevant.
Microsoft documents Roll Back Driver for this situation when the option is available. [R3]
Rolling back replaces the current Bluetooth driver with the previous one. That also gives up whatever fixes were included in the newer version, so rollback makes most sense when the failure began directly after the driver change.
What if Windows Update does not help?
Microsoft recommends checking the PC manufacturer's support site for a newer Bluetooth driver when necessary. Its Bluetooth-disappearance guidance also notes that BIOS, UEFI, or firmware updates supplied by the PC manufacturer may be relevant when ordinary Windows updates do not restore Bluetooth. [R1][R3]
Use the support site for the exact PC model. Avoid unrelated driver-download websites.
Does a missing Bluetooth toggle mean the hardware has failed?
Not automatically.
Microsoft lists driver and firmware problems alongside hardware malfunction as possible causes of disappearing Bluetooth. [R1]
Hardware becomes more suspicious when a PC that previously had working Bluetooth no longer exposes the adapter after restart, supported driver repair, Windows updates, and manufacturer-specific troubleshooting.
At that point, use the PC manufacturer's hardware diagnostics or support guidance. Software cannot repair a failed Bluetooth radio.
What about restarting the Bluetooth service?
A stopped Bluetooth service can contribute to Bluetooth problems, and Microsoft includes service troubleshooting for some Bluetooth failures. [R1][R4]
But a missing adapter should not automatically be diagnosed as a service problem. If Windows cannot detect the hardware at all, repeatedly restarting a service does not address the lower-level failure.
How do I know it is fixed?
Do not stop when Device Manager refreshes successfully or a driver installation completes.
Check that:
- the Bluetooth control is present again in Settings → Bluetooth & devices;
- Bluetooth can be switched on;
- Windows can see the intended Bluetooth device;
- the device can actually connect and perform its normal function.
The problem is resolved when Bluetooth functionality has returned, not merely when a repair command completed.