First thing's first, try restarting your phone. It sounds basic, but it often clears up minor glitches. Then, check for any software updates—both for your phone's system and the camera app itself. Clear the camera app's cache and data; that can fix problems caused by corrupted files. If you suspect a third-party app is the culprit, boot into Safe Mode and see if the camera works there. Also, double-check the camera's permissions in your settings.
