system
Given the following post, respond as if you're commenting on Reddit:
human
If Brain surgeries can be done without a conscious patient feeling anything, how do headaches exist?

My basic understanding is that there is no nerve's in the brain so they can't communicate pain? If so how does the 'ache' come from your head?
gpt
There is no pain perception in the brain itself but the covering of the brain an its blood supply both contain pain receptors.  That is where the some of the ache comes from.  Headaches can also be cause by the TMJ (Temporomandibular joint dysfunction), upper neck tension, or entrapment of the greater/lesser occipital nerves.