What are the symptoms of a bad fuse?

Could you please elaborate on the symptoms of a faulty fuse? Are there any visible signs or indicators that one can look out for, such as flickering lights or appliances not functioning properly? Also, are there any specific steps that one should take if they suspect a fuse has gone bad, like turning off the power supply and replacing the fuse? It would be great if you could provide some insight into how to identify and address this issue.