system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How does headache exactly hurts your head if your brain cannot feel pain?
gpt
There are literally hundreds of of types of headaches, so each one can be representative of something different.

Sinus pressure, vascular issues, tumor increasing intracranial pressure, muscular tension, trauma etc. The brain could be the issue but it's usually transmitting from somewhere else.